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Edit File : query.php \| Size : 36.23 KB
<?php /** * WordPress Query API * * The query API attempts to get which part of WordPress the user is on. It * also provides functionality for getting URL query information. * * @link https://developer.wordpress.org/themes/basics/the-loop/ More information on The Loop. * * @package WordPress * @subpackage Query / /* * Retrieves the value of a query variable in the WP_Query class. * * @since 1.5.0 * @since 3.9.0 The `$default_value` argument was introduced. * * @global WP_Query $wp_query WordPress Query object. * * @param string $query_var The variable key to retrieve. * @param mixed $default_value Optional. Value to return if the query variable is not set. * Default empty string. * @return mixed Contents of the query variable. / function get_query_var( $query_var, $default_value = '' ) { global $wp_query; return $wp_query->get( $query_var, $default_value ); } /* * Retrieves the currently queried object. * * Wrapper for WP_Query::get_queried_object(). * * @since 3.1.0 * * @global WP_Query $wp_query WordPress Query object. * * @return WP_Term\|WP_Post_Type\|WP_Post\|WP_User\|null The queried object. / function get_queried_object() { global $wp_query; return $wp_query->get_queried_object(); } /* * Retrieves the ID of the currently queried object. * * Wrapper for WP_Query::get_queried_object_id(). * * @since 3.1.0 * * @global WP_Query $wp_query WordPress Query object. * * @return int ID of the queried object. / function get_queried_object_id() { global $wp_query; return $wp_query->get_queried_object_id(); } /* * Sets the value of a query variable in the WP_Query class. * * @since 2.2.0 * * @global WP_Query $wp_query WordPress Query object. * * @param string $query_var Query variable key. * @param mixed $value Query variable value. / function set_query_var( $query_var, $value ) { global $wp_query; $wp_query->set( $query_var, $value ); } /* * Sets up The Loop with query parameters. * * Note: This function will completely override the main query and isn't intended for use * by plugins or themes. Its overly-simplistic approach to modifying the main query can be * problematic and should be avoided wherever possible. In most cases, there are better, * more performant options for modifying the main query such as via the {@see 'pre_get_posts'} * action within WP_Query. * * This must not be used within the WordPress Loop. * * @since 1.5.0 * * @global WP_Query $wp_query WordPress Query object. * * @param array\|string $query Array or string of WP_Query arguments. * @return WP_Post[]\|int[] Array of post objects or post IDs. / function query_posts( $query ) { $GLOBALS['wp_query'] = new WP_Query(); return $GLOBALS['wp_query']->query( $query ); } /* * Destroys the previous query and sets up a new query. * * This should be used after query_posts() and before another query_posts(). * This will remove obscure bugs that occur when the previous WP_Query object * is not destroyed properly before another is set up. * * @since 2.3.0 * * @global WP_Query $wp_query WordPress Query object. * @global WP_Query $wp_the_query Copy of the global WP_Query instance created during wp_reset_query(). / function wp_reset_query() { $GLOBALS['wp_query'] = $GLOBALS['wp_the_query']; wp_reset_postdata(); } /* * After looping through a separate query, this function restores * the $post global to the current post in the main query. * * @since 3.0.0 * * @global WP_Query $wp_query WordPress Query object. / function wp_reset_postdata() { global $wp_query; if ( isset( $wp_query ) ) { $wp_query->reset_postdata(); } } / * Query type checks. / /* * Determines whether the query is for an existing archive page. * * Archive pages include category, tag, author, date, custom post type, * and custom taxonomy based archives. * * For more information on this and similar theme functions, check out * the {@link https://developer.wordpress.org/themes/basics/conditional-tags/ * Conditional Tags} article in the Theme Developer Handbook. * * @since 1.5.0 * * @see is_category() * @see is_tag() * @see is_author() * @see is_date() * @see is_post_type_archive() * @see is_tax() * @global WP_Query $wp_query WordPress Query object. * * @return bool Whether the query is for an existing archive page. / function is_archive() { global $wp_query; if ( ! isset( $wp_query ) ) { _doing_it_wrong( __FUNCTION__, __( 'Conditional query tags do not work before the query is run. Before then, they always return false.' ), '3.1.0' ); return false; } return $wp_query->is_archive(); } /* * Determines whether the query is for an existing post type archive page. * * For more information on this and similar theme functions, check out * the {@link https://developer.wordpress.org/themes/basics/conditional-tags/ * Conditional Tags} article in the Theme Developer Handbook. * * @since 3.1.0 * * @global WP_Query $wp_query WordPress Query object. * * @param string\|string[] $post_types Optional. Post type or array of posts types * to check against. Default empty. * @return bool Whether the query is for an existing post type archive page. / function is_post_type_archive( $post_types = '' ) { global $wp_query; if ( ! isset( $wp_query ) ) { _doing_it_wrong( __FUNCTION__, __( 'Conditional query tags do not work before the query is run. Before then, they always return false.' ), '3.1.0' ); return false; } return $wp_query->is_post_type_archive( $post_types ); } /* * Determines whether the query is for an existing attachment page. * * For more information on this and similar theme functions, check out * the {@link https://developer.wordpress.org/themes/basics/conditional-tags/ * Conditional Tags} article in the Theme Developer Handbook. * * @since 2.0.0 * * @global WP_Query $wp_query WordPress Query object. * * @param int\|string\|int[]\|string[] $attachment Optional. Attachment ID, title, slug, or array of such * to check against. Default empty. * @return bool Whether the query is for an existing attachment page. / function is_attachment( $attachment = '' ) { global $wp_query; if ( ! isset( $wp_query ) ) { _doing_it_wrong( __FUNCTION__, __( 'Conditional query tags do not work before the query is run. Before then, they always return false.' ), '3.1.0' ); return false; } return $wp_query->is_attachment( $attachment ); } /* * Determines whether the query is for an existing author archive page. * * If the $author parameter is specified, this function will additionally * check if the query is for one of the authors specified. * * For more information on this and similar theme functions, check out * the {@link https://developer.wordpress.org/themes/basics/conditional-tags/ * Conditional Tags} article in the Theme Developer Handbook. * * @since 1.5.0 * * @global WP_Query $wp_query WordPress Query object. * * @param int\|string\|int[]\|string[] $author Optional. User ID, nickname, nicename, or array of such * to check against. Default empty. * @return bool Whether the query is for an existing author archive page. / function is_author( $author = '' ) { global $wp_query; if ( ! isset( $wp_query ) ) { _doing_it_wrong( __FUNCTION__, __( 'Conditional query tags do not work before the query is run. Before then, they always return false.' ), '3.1.0' ); return false; } return $wp_query->is_author( $author ); } /* * Determines whether the query is for an existing category archive page. * * If the $category parameter is specified, this function will additionally * check if the query is for one of the categories specified. * * For more information on this and similar theme functions, check out * the {@link https://developer.wordpress.org/themes/basics/conditional-tags/ * Conditional Tags} article in the Theme Developer Handbook. * * @since 1.5.0 * * @global WP_Query $wp_query WordPress Query object. * * @param int\|string\|int[]\|string[] $category Optional. Category ID, name, slug, or array of such * to check against. Default empty. * @return bool Whether the query is for an existing category archive page. / function is_category( $category = '' ) { global $wp_query; if ( ! isset( $wp_query ) ) { _doing_it_wrong( __FUNCTION__, __( 'Conditional query tags do not work before the query is run. Before then, they always return false.' ), '3.1.0' ); return false; } return $wp_query->is_category( $category ); } /* * Determines whether the query is for an existing tag archive page. * * If the $tag parameter is specified, this function will additionally * check if the query is for one of the tags specified. * * For more information on this and similar theme functions, check out * the {@link https://developer.wordpress.org/themes/basics/conditional-tags/ * Conditional Tags} article in the Theme Developer Handbook. * * @since 2.3.0 * * @global WP_Query $wp_query WordPress Query object. * * @param int\|string\|int[]\|string[] $tag Optional. Tag ID, name, slug, or array of such * to check against. Default empty. * @return bool Whether the query is for an existing tag archive page. / function is_tag( $tag = '' ) { global $wp_query; if ( ! isset( $wp_query ) ) { _doing_it_wrong( __FUNCTION__, __( 'Conditional query tags do not work before the query is run. Before then, they always return false.' ), '3.1.0' ); return false; } return $wp_query->is_tag( $tag ); } /* * Determines whether the query is for an existing custom taxonomy archive page. * * If the $taxonomy parameter is specified, this function will additionally * check if the query is for that specific $taxonomy. * * If the $term parameter is specified in addition to the $taxonomy parameter, * this function will additionally check if the query is for one of the terms * specified. * * For more information on this and similar theme functions, check out * the {@link https://developer.wordpress.org/themes/basics/conditional-tags/ * Conditional Tags} article in the Theme Developer Handbook. * * @since 2.5.0 * * @global WP_Query $wp_query WordPress Query object. * * @param string\|string[] $taxonomy Optional. Taxonomy slug or slugs to check against. * Default empty. * @param int\|string\|int[]\|string[] $term Optional. Term ID, name, slug, or array of such * to check against. Default empty. * @return bool Whether the query is for an existing custom taxonomy archive page. * True for custom taxonomy archive pages, false for built-in taxonomies * (category and tag archives). / function is_tax( $taxonomy = '', $term = '' ) { global $wp_query; if ( ! isset( $wp_query ) ) { _doing_it_wrong( __FUNCTION__, __( 'Conditional query tags do not work before the query is run. Before then, they always return false.' ), '3.1.0' ); return false; } return $wp_query->is_tax( $taxonomy, $term ); } /* * Determines whether the query is for an existing date archive. * * For more information on this and similar theme functions, check out * the {@link https://developer.wordpress.org/themes/basics/conditional-tags/ * Conditional Tags} article in the Theme Developer Handbook. * * @since 1.5.0 * * @global WP_Query $wp_query WordPress Query object. * * @return bool Whether the query is for an existing date archive. / function is_date() { global $wp_query; if ( ! isset( $wp_query ) ) { _doing_it_wrong( __FUNCTION__, __( 'Conditional query tags do not work before the query is run. Before then, they always return false.' ), '3.1.0' ); return false; } return $wp_query->is_date(); } /* * Determines whether the query is for an existing day archive. * * A conditional check to test whether the page is a date-based archive page displaying posts for the current day. * * For more information on this and similar theme functions, check out * the {@link https://developer.wordpress.org/themes/basics/conditional-tags/ * Conditional Tags} article in the Theme Developer Handbook. * * @since 1.5.0 * * @global WP_Query $wp_query WordPress Query object. * * @return bool Whether the query is for an existing day archive. / function is_day() { global $wp_query; if ( ! isset( $wp_query ) ) { _doing_it_wrong( __FUNCTION__, __( 'Conditional query tags do not work before the query is run. Before then, they always return false.' ), '3.1.0' ); return false; } return $wp_query->is_day(); } /* * Determines whether the query is for a feed. * * For more information on this and similar theme functions, check out * the {@link https://developer.wordpress.org/themes/basics/conditional-tags/ * Conditional Tags} article in the Theme Developer Handbook. * * @since 1.5.0 * * @global WP_Query $wp_query WordPress Query object. * * @param string\|string[] $feeds Optional. Feed type or array of feed types * to check against. Default empty. * @return bool Whether the query is for a feed. / function is_feed( $feeds = '' ) { global $wp_query; if ( ! isset( $wp_query ) ) { _doing_it_wrong( __FUNCTION__, __( 'Conditional query tags do not work before the query is run. Before then, they always return false.' ), '3.1.0' ); return false; } return $wp_query->is_feed( $feeds ); } /* * Is the query for a comments feed? * * @since 3.0.0 * * @global WP_Query $wp_query WordPress Query object. * * @return bool Whether the query is for a comments feed. / function is_comment_feed() { global $wp_query; if ( ! isset( $wp_query ) ) { _doing_it_wrong( __FUNCTION__, __( 'Conditional query tags do not work before the query is run. Before then, they always return false.' ), '3.1.0' ); return false; } return $wp_query->is_comment_feed(); } /* * Determines whether the query is for the front page of the site. * * This is for what is displayed at your site's main URL. * * Depends on the site's "Front page displays" Reading Settings 'show_on_front' and 'page_on_front'. * * If you set a static page for the front page of your site, this function will return * true when viewing that page. * * Otherwise the same as {@see is_home()}. * * For more information on this and similar theme functions, check out * the {@link https://developer.wordpress.org/themes/basics/conditional-tags/ * Conditional Tags} article in the Theme Developer Handbook. * * @since 2.5.0 * * @global WP_Query $wp_query WordPress Query object. * * @return bool Whether the query is for the front page of the site. / function is_front_page() { global $wp_query; if ( ! isset( $wp_query ) ) { _doing_it_wrong( __FUNCTION__, __( 'Conditional query tags do not work before the query is run. Before then, they always return false.' ), '3.1.0' ); return false; } return $wp_query->is_front_page(); } /* * Determines whether the query is for the blog homepage. * * The blog homepage is the page that shows the time-based blog content of the site. * * is_home() is dependent on the site's "Front page displays" Reading Settings 'show_on_front' * and 'page_for_posts'. * * If a static page is set for the front page of the site, this function will return true only * on the page you set as the "Posts page". * * For more information on this and similar theme functions, check out * the {@link https://developer.wordpress.org/themes/basics/conditional-tags/ * Conditional Tags} article in the Theme Developer Handbook. * * @since 1.5.0 * * @see is_front_page() * @global WP_Query $wp_query WordPress Query object. * * @return bool Whether the query is for the blog homepage. / function is_home() { global $wp_query; if ( ! isset( $wp_query ) ) { _doing_it_wrong( __FUNCTION__, __( 'Conditional query tags do not work before the query is run. Before then, they always return false.' ), '3.1.0' ); return false; } return $wp_query->is_home(); } /* * Determines whether the query is for the Privacy Policy page. * * The Privacy Policy page is the page that shows the Privacy Policy content of the site. * * is_privacy_policy() is dependent on the site's "Change your Privacy Policy page" Privacy Settings 'wp_page_for_privacy_policy'. * * This function will return true only on the page you set as the "Privacy Policy page". * * For more information on this and similar theme functions, check out * the {@link https://developer.wordpress.org/themes/basics/conditional-tags/ * Conditional Tags} article in the Theme Developer Handbook. * * @since 5.2.0 * * @global WP_Query $wp_query WordPress Query object. * * @return bool Whether the query is for the Privacy Policy page. / function is_privacy_policy() { global $wp_query; if ( ! isset( $wp_query ) ) { _doing_it_wrong( __FUNCTION__, __( 'Conditional query tags do not work before the query is run. Before then, they always return false.' ), '3.1.0' ); return false; } return $wp_query->is_privacy_policy(); } /* * Determines whether the query is for an existing month archive. * * For more information on this and similar theme functions, check out * the {@link https://developer.wordpress.org/themes/basics/conditional-tags/ * Conditional Tags} article in the Theme Developer Handbook. * * @since 1.5.0 * * @global WP_Query $wp_query WordPress Query object. * * @return bool Whether the query is for an existing month archive. / function is_month() { global $wp_query; if ( ! isset( $wp_query ) ) { _doing_it_wrong( __FUNCTION__, __( 'Conditional query tags do not work before the query is run. Before then, they always return false.' ), '3.1.0' ); return false; } return $wp_query->is_month(); } /* * Determines whether the query is for an existing single page. * * If the $page parameter is specified, this function will additionally * check if the query is for one of the pages specified. * * For more information on this and similar theme functions, check out * the {@link https://developer.wordpress.org/themes/basics/conditional-tags/ * Conditional Tags} article in the Theme Developer Handbook. * * @since 1.5.0 * * @see is_single() * @see is_singular() * @global WP_Query $wp_query WordPress Query object. * * @param int\|string\|int[]\|string[] $page Optional. Page ID, title, slug, or array of such * to check against. Default empty. * @return bool Whether the query is for an existing single page. / function is_page( $page = '' ) { global $wp_query; if ( ! isset( $wp_query ) ) { _doing_it_wrong( __FUNCTION__, __( 'Conditional query tags do not work before the query is run. Before then, they always return false.' ), '3.1.0' ); return false; } return $wp_query->is_page( $page ); } /* * Determines whether the query is for a paged result and not for the first page. * * For more information on this and similar theme functions, check out * the {@link https://developer.wordpress.org/themes/basics/conditional-tags/ * Conditional Tags} article in the Theme Developer Handbook. * * @since 1.5.0 * * @global WP_Query $wp_query WordPress Query object. * * @return bool Whether the query is for a paged result. / function is_paged() { global $wp_query; if ( ! isset( $wp_query ) ) { _doing_it_wrong( __FUNCTION__, __( 'Conditional query tags do not work before the query is run. Before then, they always return false.' ), '3.1.0' ); return false; } return $wp_query->is_paged(); } /* * Determines whether the query is for a post or page preview. * * For more information on this and similar theme functions, check out * the {@link https://developer.wordpress.org/themes/basics/conditional-tags/ * Conditional Tags} article in the Theme Developer Handbook. * * @since 2.0.0 * * @global WP_Query $wp_query WordPress Query object. * * @return bool Whether the query is for a post or page preview. / function is_preview() { global $wp_query; if ( ! isset( $wp_query ) ) { _doing_it_wrong( __FUNCTION__, __( 'Conditional query tags do not work before the query is run. Before then, they always return false.' ), '3.1.0' ); return false; } return $wp_query->is_preview(); } /* * Is the query for the robots.txt file? * * @since 2.1.0 * * @global WP_Query $wp_query WordPress Query object. * * @return bool Whether the query is for the robots.txt file. / function is_robots() { global $wp_query; if ( ! isset( $wp_query ) ) { _doing_it_wrong( __FUNCTION__, __( 'Conditional query tags do not work before the query is run. Before then, they always return false.' ), '3.1.0' ); return false; } return $wp_query->is_robots(); } /* * Is the query for the favicon.ico file? * * @since 5.4.0 * * @global WP_Query $wp_query WordPress Query object. * * @return bool Whether the query is for the favicon.ico file. / function is_favicon() { global $wp_query; if ( ! isset( $wp_query ) ) { _doing_it_wrong( __FUNCTION__, __( 'Conditional query tags do not work before the query is run. Before then, they always return false.' ), '3.1.0' ); return false; } return $wp_query->is_favicon(); } /* * Determines whether the query is for a search. * * For more information on this and similar theme functions, check out * the {@link https://developer.wordpress.org/themes/basics/conditional-tags/ * Conditional Tags} article in the Theme Developer Handbook. * * @since 1.5.0 * * @global WP_Query $wp_query WordPress Query object. * * @return bool Whether the query is for a search. / function is_search() { global $wp_query; if ( ! isset( $wp_query ) ) { _doing_it_wrong( __FUNCTION__, __( 'Conditional query tags do not work before the query is run. Before then, they always return false.' ), '3.1.0' ); return false; } return $wp_query->is_search(); } /* * Determines whether the query is for an existing single post. * * Works for any post type, except attachments and pages * * If the $post parameter is specified, this function will additionally * check if the query is for one of the Posts specified. * * For more information on this and similar theme functions, check out * the {@link https://developer.wordpress.org/themes/basics/conditional-tags/ * Conditional Tags} article in the Theme Developer Handbook. * * @since 1.5.0 * * @see is_page() * @see is_singular() * @global WP_Query $wp_query WordPress Query object. * * @param int\|string\|int[]\|string[] $post Optional. Post ID, title, slug, or array of such * to check against. Default empty. * @return bool Whether the query is for an existing single post. / function is_single( $post = '' ) { global $wp_query; if ( ! isset( $wp_query ) ) { _doing_it_wrong( __FUNCTION__, __( 'Conditional query tags do not work before the query is run. Before then, they always return false.' ), '3.1.0' ); return false; } return $wp_query->is_single( $post ); } /* * Determines whether the query is for an existing single post of any post type * (post, attachment, page, custom post types). * * If the $post_types parameter is specified, this function will additionally * check if the query is for one of the Posts Types specified. * * For more information on this and similar theme functions, check out * the {@link https://developer.wordpress.org/themes/basics/conditional-tags/ * Conditional Tags} article in the Theme Developer Handbook. * * @since 1.5.0 * * @see is_page() * @see is_single() * @global WP_Query $wp_query WordPress Query object. * * @param string\|string[] $post_types Optional. Post type or array of post types * to check against. Default empty. * @return bool Whether the query is for an existing single post * or any of the given post types. / function is_singular( $post_types = '' ) { global $wp_query; if ( ! isset( $wp_query ) ) { _doing_it_wrong( __FUNCTION__, __( 'Conditional query tags do not work before the query is run. Before then, they always return false.' ), '3.1.0' ); return false; } return $wp_query->is_singular( $post_types ); } /* * Determines whether the query is for a specific time. * * For more information on this and similar theme functions, check out * the {@link https://developer.wordpress.org/themes/basics/conditional-tags/ * Conditional Tags} article in the Theme Developer Handbook. * * @since 1.5.0 * * @global WP_Query $wp_query WordPress Query object. * * @return bool Whether the query is for a specific time. / function is_time() { global $wp_query; if ( ! isset( $wp_query ) ) { _doing_it_wrong( __FUNCTION__, __( 'Conditional query tags do not work before the query is run. Before then, they always return false.' ), '3.1.0' ); return false; } return $wp_query->is_time(); } /* * Determines whether the query is for a trackback endpoint call. * * For more information on this and similar theme functions, check out * the {@link https://developer.wordpress.org/themes/basics/conditional-tags/ * Conditional Tags} article in the Theme Developer Handbook. * * @since 1.5.0 * * @global WP_Query $wp_query WordPress Query object. * * @return bool Whether the query is for a trackback endpoint call. / function is_trackback() { global $wp_query; if ( ! isset( $wp_query ) ) { _doing_it_wrong( __FUNCTION__, __( 'Conditional query tags do not work before the query is run. Before then, they always return false.' ), '3.1.0' ); return false; } return $wp_query->is_trackback(); } /* * Determines whether the query is for an existing year archive. * * For more information on this and similar theme functions, check out * the {@link https://developer.wordpress.org/themes/basics/conditional-tags/ * Conditional Tags} article in the Theme Developer Handbook. * * @since 1.5.0 * * @global WP_Query $wp_query WordPress Query object. * * @return bool Whether the query is for an existing year archive. / function is_year() { global $wp_query; if ( ! isset( $wp_query ) ) { _doing_it_wrong( __FUNCTION__, __( 'Conditional query tags do not work before the query is run. Before then, they always return false.' ), '3.1.0' ); return false; } return $wp_query->is_year(); } /* * Determines whether the query has resulted in a 404 (returns no results). * * For more information on this and similar theme functions, check out * the {@link https://developer.wordpress.org/themes/basics/conditional-tags/ * Conditional Tags} article in the Theme Developer Handbook. * * @since 1.5.0 * * @global WP_Query $wp_query WordPress Query object. * * @return bool Whether the query is a 404 error. / function is_404() { global $wp_query; if ( ! isset( $wp_query ) ) { _doing_it_wrong( __FUNCTION__, __( 'Conditional query tags do not work before the query is run. Before then, they always return false.' ), '3.1.0' ); return false; } return $wp_query->is_404(); } /* * Is the query for an embedded post? * * @since 4.4.0 * * @global WP_Query $wp_query WordPress Query object. * * @return bool Whether the query is for an embedded post. / function is_embed() { global $wp_query; if ( ! isset( $wp_query ) ) { _doing_it_wrong( __FUNCTION__, __( 'Conditional query tags do not work before the query is run. Before then, they always return false.' ), '3.1.0' ); return false; } return $wp_query->is_embed(); } /* * Determines whether the query is the main query. * * For more information on this and similar theme functions, check out * the {@link https://developer.wordpress.org/themes/basics/conditional-tags/ * Conditional Tags} article in the Theme Developer Handbook. * * @since 3.3.0 * * @global WP_Query $wp_query WordPress Query object. * * @return bool Whether the query is the main query. / function is_main_query() { global $wp_query; if ( ! isset( $wp_query ) ) { _doing_it_wrong( __FUNCTION__, __( 'Conditional query tags do not work before the query is run. Before then, they always return false.' ), '6.1.0' ); return false; } if ( 'pre_get_posts' === current_filter() ) { _doing_it_wrong( __FUNCTION__, sprintf( / translators: 1: pre_get_posts, 2: WP_Query->is_main_query(), 3: is_main_query(), 4: Documentation URL. / __( 'In %1$s, use the %2$s method, not the %3$s function. See %4$s.' ), '<code>pre_get_posts</code>', '<code>WP_Query->is_main_query()</code>', '<code>is_main_query()</code>', __( 'https://developer.wordpress.org/reference/functions/is_main_query/' ) ), '3.7.0' ); } return $wp_query->is_main_query(); } / * The Loop. Post loop control. / /* * Determines whether current WordPress query has posts to loop over. * * @since 1.5.0 * * @global WP_Query $wp_query WordPress Query object. * * @return bool True if posts are available, false if end of the loop. / function have_posts() { global $wp_query; if ( ! isset( $wp_query ) ) { return false; } return $wp_query->have_posts(); } /* * Determines whether the caller is in the Loop. * * For more information on this and similar theme functions, check out * the {@link https://developer.wordpress.org/themes/basics/conditional-tags/ * Conditional Tags} article in the Theme Developer Handbook. * * @since 2.0.0 * * @global WP_Query $wp_query WordPress Query object. * * @return bool True if caller is within loop, false if loop hasn't started or ended. / function in_the_loop() { global $wp_query; if ( ! isset( $wp_query ) ) { return false; } return $wp_query->in_the_loop; } /* * Rewind the loop posts. * * @since 1.5.0 * * @global WP_Query $wp_query WordPress Query object. / function rewind_posts() { global $wp_query; if ( ! isset( $wp_query ) ) { return; } $wp_query->rewind_posts(); } /* * Iterate the post index in the loop. * * @since 1.5.0 * * @global WP_Query $wp_query WordPress Query object. / function the_post() { global $wp_query; if ( ! isset( $wp_query ) ) { return; } $wp_query->the_post(); } / * Comments loop. / /* * Determines whether current WordPress query has comments to loop over. * * @since 2.2.0 * * @global WP_Query $wp_query WordPress Query object. * * @return bool True if comments are available, false if no more comments. / function have_comments() { global $wp_query; if ( ! isset( $wp_query ) ) { return false; } return $wp_query->have_comments(); } /* * Iterate comment index in the comment loop. * * @since 2.2.0 * * @global WP_Query $wp_query WordPress Query object. / function the_comment() { global $wp_query; if ( ! isset( $wp_query ) ) { return; } $wp_query->the_comment(); } /* * Redirect old slugs to the correct permalink. * * Attempts to find the current slug from the past slugs. * * @since 2.1.0 / function wp_old_slug_redirect() { if ( is_404() && '' !== get_query_var( 'name' ) ) { // Guess the current post type based on the query vars. if ( get_query_var( 'post_type' ) ) { $post_type = get_query_var( 'post_type' ); } elseif ( get_query_var( 'attachment' ) ) { $post_type = 'attachment'; } elseif ( get_query_var( 'pagename' ) ) { $post_type = 'page'; } else { $post_type = 'post'; } if ( is_array( $post_type ) ) { if ( count( $post_type ) > 1 ) { return; } $post_type = reset( $post_type ); } // Do not attempt redirect for hierarchical post types. if ( is_post_type_hierarchical( $post_type ) ) { return; } $id = _find_post_by_old_slug( $post_type ); if ( ! $id ) { $id = _find_post_by_old_date( $post_type ); } /* * Filters the old slug redirect post ID. * * @since 4.9.3 * * @param int $id The redirect post ID. / $id = apply_filters( 'old_slug_redirect_post_id', $id ); if ( ! $id ) { return; } $link = get_permalink( $id ); if ( get_query_var( 'paged' ) > 1 ) { $link = user_trailingslashit( trailingslashit( $link ) . 'page/' . get_query_var( 'paged' ) ); } elseif ( is_embed() ) { $link = user_trailingslashit( trailingslashit( $link ) . 'embed' ); } /* * Filters the old slug redirect URL. * * @since 4.4.0 * * @param string $link The redirect URL. / $link = apply_filters( 'old_slug_redirect_url', $link ); if ( ! $link ) { return; } wp_redirect( $link, 301 ); // Permanent redirect. exit; } } /* * Find the post ID for redirecting an old slug. * * @since 4.9.3 * @access private * * @see wp_old_slug_redirect() * @global wpdb $wpdb WordPress database abstraction object. * * @param string $post_type The current post type based on the query vars. * @return int The Post ID. / function _find_post_by_old_slug( $post_type ) { global $wpdb; $query = $wpdb->prepare( "SELECT post_id FROM $wpdb->postmeta, $wpdb->posts WHERE ID = post_id AND post_type = %s AND meta_key = '_wp_old_slug' AND meta_value = %s", $post_type, get_query_var( 'name' ) ); / * If year, monthnum, or day have been specified, make our query more precise * just in case there are multiple identical _wp_old_slug values. / if ( get_query_var( 'year' ) ) { $query .= $wpdb->prepare( ' AND YEAR(post_date) = %d', get_query_var( 'year' ) ); } if ( get_query_var( 'monthnum' ) ) { $query .= $wpdb->prepare( ' AND MONTH(post_date) = %d', get_query_var( 'monthnum' ) ); } if ( get_query_var( 'day' ) ) { $query .= $wpdb->prepare( ' AND DAYOFMONTH(post_date) = %d', get_query_var( 'day' ) ); } $key = md5( $query ); $last_changed = wp_cache_get_last_changed( 'posts' ); $cache_key = "find_post_by_old_slug:$key"; $cache = wp_cache_get_salted( $cache_key, 'post-queries', $last_changed ); if ( false !== $cache ) { $id = $cache; } else { $id = (int) $wpdb->get_var( $query ); wp_cache_set_salted( $cache_key, $id, 'post-queries', $last_changed ); } return $id; } /* * Find the post ID for redirecting an old date. * * @since 4.9.3 * @access private * * @see wp_old_slug_redirect() * @global wpdb $wpdb WordPress database abstraction object. * * @param string $post_type The current post type based on the query vars. * @return int The Post ID. / function _find_post_by_old_date( $post_type ) { global $wpdb; $date_query = ''; if ( get_query_var( 'year' ) ) { $date_query .= $wpdb->prepare( ' AND YEAR(pm_date.meta_value) = %d', get_query_var( 'year' ) ); } if ( get_query_var( 'monthnum' ) ) { $date_query .= $wpdb->prepare( ' AND MONTH(pm_date.meta_value) = %d', get_query_var( 'monthnum' ) ); } if ( get_query_var( 'day' ) ) { $date_query .= $wpdb->prepare( ' AND DAYOFMONTH(pm_date.meta_value) = %d', get_query_var( 'day' ) ); } $id = 0; if ( $date_query ) { $query = $wpdb->prepare( "SELECT post_id FROM $wpdb->postmeta AS pm_date, $wpdb->posts WHERE ID = post_id AND post_type = %s AND meta_key = '_wp_old_date' AND post_name = %s" . $date_query, $post_type, get_query_var( 'name' ) ); $key = md5( $query ); $last_changed = wp_cache_get_last_changed( 'posts' ); $cache_key = "find_post_by_old_date:$key"; $cache = wp_cache_get_salted( $cache_key, 'post-queries', $last_changed ); if ( false !== $cache ) { $id = $cache; } else { $id = (int) $wpdb->get_var( $query ); if ( ! $id ) { // Check to see if an old slug matches the old date. $id = (int) $wpdb->get_var( $wpdb->prepare( "SELECT ID FROM $wpdb->posts, $wpdb->postmeta AS pm_slug, $wpdb->postmeta AS pm_date WHERE ID = pm_slug.post_id AND ID = pm_date.post_id AND post_type = %s AND pm_slug.meta_key = '_wp_old_slug' AND pm_slug.meta_value = %s AND pm_date.meta_key = '_wp_old_date'" . $date_query, $post_type, get_query_var( 'name' ) ) ); } wp_cache_set_salted( $cache_key, $id, 'post-queries', $last_changed ); } } return $id; } /* * Set up global post data. * * @since 1.5.0 * @since 4.4.0 Added the ability to pass a post ID to `$post`. * * @global WP_Query $wp_query WordPress Query object. * * @param WP_Post\|object\|int $post WP_Post instance or Post ID/object. * @return bool True when finished. / function setup_postdata( $post ) { global $wp_query; if ( ! empty( $wp_query ) && $wp_query instanceof WP_Query ) { return $wp_query->setup_postdata( $post ); } return false; } /* * Generates post data. * * @since 5.2.0 * * @global WP_Query $wp_query WordPress Query object. * * @param WP_Post\|object\|int $post WP_Post instance or Post ID/object. * @return array\|false Elements of post, or false on failure. */ function generate_postdata( $post ) { global $wp_query; if ( ! empty( $wp_query ) && $wp_query instanceof WP_Query ) { return $wp_query->generate_postdata( $post ); } return false; } Back

Edit File : query.php | Size : 36.23 KB

<?php
/**
 * WordPress Query API
 *
 * The query API attempts to get which part of WordPress the user is on. It
 * also provides functionality for getting URL query information.
 *
 * @link https://developer.wordpress.org/themes/basics/the-loop/ More information on The Loop.
 *
 * @package WordPress
 * @subpackage Query
 */

/**
 * Retrieves the value of a query variable in the WP_Query class.
 *
 * @since 1.5.0
 * @since 3.9.0 The `$default_value` argument was introduced.
 *
 * @global WP_Query $wp_query WordPress Query object.
 *
 * @param string $query_var     The variable key to retrieve.
 * @param mixed  $default_value Optional. Value to return if the query variable is not set.
 *                              Default empty string.
 * @return mixed Contents of the query variable.
 */
function get_query_var( $query_var, $default_value = '' ) {
	global $wp_query;
	return $wp_query->get( $query_var, $default_value );
}

/**
 * Retrieves the currently queried object.
 *
 * Wrapper for WP_Query::get_queried_object().
 *
 * @since 3.1.0
 *
 * @global WP_Query $wp_query WordPress Query object.
 *
 * @return WP_Term|WP_Post_Type|WP_Post|WP_User|null The queried object.
 */
function get_queried_object() {
	global $wp_query;
	return $wp_query->get_queried_object();
}

/**
 * Retrieves the ID of the currently queried object.
 *
 * Wrapper for WP_Query::get_queried_object_id().
 *
 * @since 3.1.0
 *
 * @global WP_Query $wp_query WordPress Query object.
 *
 * @return int ID of the queried object.
 */
function get_queried_object_id() {
	global $wp_query;
	return $wp_query->get_queried_object_id();
}

/**
 * Sets the value of a query variable in the WP_Query class.
 *
 * @since 2.2.0
 *
 * @global WP_Query $wp_query WordPress Query object.
 *
 * @param string $query_var Query variable key.
 * @param mixed  $value     Query variable value.
 */
function set_query_var( $query_var, $value ) {
	global $wp_query;
	$wp_query->set( $query_var, $value );
}

/**
 * Sets up The Loop with query parameters.
 *
 * Note: This function will completely override the main query and isn't intended for use
 * by plugins or themes. Its overly-simplistic approach to modifying the main query can be
 * problematic and should be avoided wherever possible. In most cases, there are better,
 * more performant options for modifying the main query such as via the {@see 'pre_get_posts'}
 * action within WP_Query.
 *
 * This must not be used within the WordPress Loop.
 *
 * @since 1.5.0
 *
 * @global WP_Query $wp_query WordPress Query object.
 *
 * @param array|string $query Array or string of WP_Query arguments.
 * @return WP_Post[]|int[] Array of post objects or post IDs.
 */
function query_posts( $query ) {
	$GLOBALS['wp_query'] = new WP_Query();
	return $GLOBALS['wp_query']->query( $query );
}

/**
 * Destroys the previous query and sets up a new query.
 *
 * This should be used after query_posts() and before another query_posts().
 * This will remove obscure bugs that occur when the previous WP_Query object
 * is not destroyed properly before another is set up.
 *
 * @since 2.3.0
 *
 * @global WP_Query $wp_query     WordPress Query object.
 * @global WP_Query $wp_the_query Copy of the global WP_Query instance created during wp_reset_query().
 */
function wp_reset_query() {
	$GLOBALS['wp_query'] = $GLOBALS['wp_the_query'];
	wp_reset_postdata();
}

/**
 * After looping through a separate query, this function restores
 * the $post global to the current post in the main query.
 *
 * @since 3.0.0
 *
 * @global WP_Query $wp_query WordPress Query object.
 */
function wp_reset_postdata() {
	global $wp_query;

if ( isset( $wp_query ) ) {
		$wp_query->reset_postdata();
	}
}

/*
 * Query type checks.
 */

/**
 * Determines whether the query is for an existing archive page.
 *
 * Archive pages include category, tag, author, date, custom post type,
 * and custom taxonomy based archives.
 *
 * For more information on this and similar theme functions, check out
 * the {@link https://developer.wordpress.org/themes/basics/conditional-tags/
 * Conditional Tags} article in the Theme Developer Handbook.
 *
 * @since 1.5.0
 *
 * @see is_category()
 * @see is_tag()
 * @see is_author()
 * @see is_date()
 * @see is_post_type_archive()
 * @see is_tax()
 * @global WP_Query $wp_query WordPress Query object.
 *
 * @return bool Whether the query is for an existing archive page.
 */
function is_archive() {
	global $wp_query;

if ( ! isset( $wp_query ) ) {
		_doing_it_wrong( __FUNCTION__, __( 'Conditional query tags do not work before the query is run. Before then, they always return false.' ), '3.1.0' );
		return false;
	}

return $wp_query->is_archive();
}

/**
 * Determines whether the query is for an existing post type archive page.
 *
 * For more information on this and similar theme functions, check out
 * the {@link https://developer.wordpress.org/themes/basics/conditional-tags/
 * Conditional Tags} article in the Theme Developer Handbook.
 *
 * @since 3.1.0
 *
 * @global WP_Query $wp_query WordPress Query object.
 *
 * @param string|string[] $post_types Optional. Post type or array of posts types
 *                                    to check against. Default empty.
 * @return bool Whether the query is for an existing post type archive page.
 */
function is_post_type_archive( $post_types = '' ) {
	global $wp_query;

return $wp_query->is_post_type_archive( $post_types );
}

/**
 * Determines whether the query is for an existing attachment page.
 *
 * For more information on this and similar theme functions, check out
 * the {@link https://developer.wordpress.org/themes/basics/conditional-tags/
 * Conditional Tags} article in the Theme Developer Handbook.
 *
 * @since 2.0.0
 *
 * @global WP_Query $wp_query WordPress Query object.
 *
 * @param int|string|int[]|string[] $attachment Optional. Attachment ID, title, slug, or array of such
 *                                              to check against. Default empty.
 * @return bool Whether the query is for an existing attachment page.
 */
function is_attachment( $attachment = '' ) {
	global $wp_query;

return $wp_query->is_attachment( $attachment );
}

/**
 * Determines whether the query is for an existing author archive page.
 *
 * If the $author parameter is specified, this function will additionally
 * check if the query is for one of the authors specified.
 *
 * For more information on this and similar theme functions, check out
 * the {@link https://developer.wordpress.org/themes/basics/conditional-tags/
 * Conditional Tags} article in the Theme Developer Handbook.
 *
 * @since 1.5.0
 *
 * @global WP_Query $wp_query WordPress Query object.
 *
 * @param int|string|int[]|string[] $author Optional. User ID, nickname, nicename, or array of such
 *                                          to check against. Default empty.
 * @return bool Whether the query is for an existing author archive page.
 */
function is_author( $author = '' ) {
	global $wp_query;

return $wp_query->is_author( $author );
}

/**
 * Determines whether the query is for an existing category archive page.
 *
 * If the $category parameter is specified, this function will additionally
 * check if the query is for one of the categories specified.
 *
 * For more information on this and similar theme functions, check out
 * the {@link https://developer.wordpress.org/themes/basics/conditional-tags/
 * Conditional Tags} article in the Theme Developer Handbook.
 *
 * @since 1.5.0
 *
 * @global WP_Query $wp_query WordPress Query object.
 *
 * @param int|string|int[]|string[] $category Optional. Category ID, name, slug, or array of such
 *                                            to check against. Default empty.
 * @return bool Whether the query is for an existing category archive page.
 */
function is_category( $category = '' ) {
	global $wp_query;

return $wp_query->is_category( $category );
}

/**
 * Determines whether the query is for an existing tag archive page.
 *
 * If the $tag parameter is specified, this function will additionally
 * check if the query is for one of the tags specified.
 *
 * For more information on this and similar theme functions, check out
 * the {@link https://developer.wordpress.org/themes/basics/conditional-tags/
 * Conditional Tags} article in the Theme Developer Handbook.
 *
 * @since 2.3.0
 *
 * @global WP_Query $wp_query WordPress Query object.
 *
 * @param int|string|int[]|string[] $tag Optional. Tag ID, name, slug, or array of such
 *                                       to check against. Default empty.
 * @return bool Whether the query is for an existing tag archive page.
 */
function is_tag( $tag = '' ) {
	global $wp_query;

return $wp_query->is_tag( $tag );
}

/**
 * Determines whether the query is for an existing custom taxonomy archive page.
 *
 * If the $taxonomy parameter is specified, this function will additionally
 * check if the query is for that specific $taxonomy.
 *
 * If the $term parameter is specified in addition to the $taxonomy parameter,
 * this function will additionally check if the query is for one of the terms
 * specified.
 *
 * For more information on this and similar theme functions, check out
 * the {@link https://developer.wordpress.org/themes/basics/conditional-tags/
 * Conditional Tags} article in the Theme Developer Handbook.
 *
 * @since 2.5.0
 *
 * @global WP_Query $wp_query WordPress Query object.
 *
 * @param string|string[]           $taxonomy Optional. Taxonomy slug or slugs to check against.
 *                                            Default empty.
 * @param int|string|int[]|string[] $term     Optional. Term ID, name, slug, or array of such
 *                                            to check against. Default empty.
 * @return bool Whether the query is for an existing custom taxonomy archive page.
 *              True for custom taxonomy archive pages, false for built-in taxonomies
 *              (category and tag archives).
 */
function is_tax( $taxonomy = '', $term = '' ) {
	global $wp_query;

return $wp_query->is_tax( $taxonomy, $term );
}

/**
 * Determines whether the query is for an existing date archive.
 *
 * For more information on this and similar theme functions, check out
 * the {@link https://developer.wordpress.org/themes/basics/conditional-tags/
 * Conditional Tags} article in the Theme Developer Handbook.
 *
 * @since 1.5.0
 *
 * @global WP_Query $wp_query WordPress Query object.
 *
 * @return bool Whether the query is for an existing date archive.
 */
function is_date() {
	global $wp_query;

return $wp_query->is_date();
}

/**
 * Determines whether the query is for an existing day archive.
 *
 * A conditional check to test whether the page is a date-based archive page displaying posts for the current day.
 *
 * For more information on this and similar theme functions, check out
 * the {@link https://developer.wordpress.org/themes/basics/conditional-tags/
 * Conditional Tags} article in the Theme Developer Handbook.
 *
 * @since 1.5.0
 *
 * @global WP_Query $wp_query WordPress Query object.
 *
 * @return bool Whether the query is for an existing day archive.
 */
function is_day() {
	global $wp_query;

return $wp_query->is_day();
}

/**
 * Determines whether the query is for a feed.
 *
 * For more information on this and similar theme functions, check out
 * the {@link https://developer.wordpress.org/themes/basics/conditional-tags/
 * Conditional Tags} article in the Theme Developer Handbook.
 *
 * @since 1.5.0
 *
 * @global WP_Query $wp_query WordPress Query object.
 *
 * @param string|string[] $feeds Optional. Feed type or array of feed types
 *                                         to check against. Default empty.
 * @return bool Whether the query is for a feed.
 */
function is_feed( $feeds = '' ) {
	global $wp_query;

return $wp_query->is_feed( $feeds );
}

/**
 * Is the query for a comments feed?
 *
 * @since 3.0.0
 *
 * @global WP_Query $wp_query WordPress Query object.
 *
 * @return bool Whether the query is for a comments feed.
 */
function is_comment_feed() {
	global $wp_query;

return $wp_query->is_comment_feed();
}

/**
 * Determines whether the query is for the front page of the site.
 *
 * This is for what is displayed at your site's main URL.
 *
 * Depends on the site's "Front page displays" Reading Settings 'show_on_front' and 'page_on_front'.
 *
 * If you set a static page for the front page of your site, this function will return
 * true when viewing that page.
 *
 * Otherwise the same as {@see is_home()}.
 *
 * For more information on this and similar theme functions, check out
 * the {@link https://developer.wordpress.org/themes/basics/conditional-tags/
 * Conditional Tags} article in the Theme Developer Handbook.
 *
 * @since 2.5.0
 *
 * @global WP_Query $wp_query WordPress Query object.
 *
 * @return bool Whether the query is for the front page of the site.
 */
function is_front_page() {
	global $wp_query;

return $wp_query->is_front_page();
}

/**
 * Determines whether the query is for the blog homepage.
 *
 * The blog homepage is the page that shows the time-based blog content of the site.
 *
 * is_home() is dependent on the site's "Front page displays" Reading Settings 'show_on_front'
 * and 'page_for_posts'.
 *
 * If a static page is set for the front page of the site, this function will return true only
 * on the page you set as the "Posts page".
 *
 * For more information on this and similar theme functions, check out
 * the {@link https://developer.wordpress.org/themes/basics/conditional-tags/
 * Conditional Tags} article in the Theme Developer Handbook.
 *
 * @since 1.5.0
 *
 * @see is_front_page()
 * @global WP_Query $wp_query WordPress Query object.
 *
 * @return bool Whether the query is for the blog homepage.
 */
function is_home() {
	global $wp_query;

return $wp_query->is_home();
}

/**
 * Determines whether the query is for the Privacy Policy page.
 *
 * The Privacy Policy page is the page that shows the Privacy Policy content of the site.
 *
 * is_privacy_policy() is dependent on the site's "Change your Privacy Policy page" Privacy Settings 'wp_page_for_privacy_policy'.
 *
 * This function will return true only on the page you set as the "Privacy Policy page".
 *
 * For more information on this and similar theme functions, check out
 * the {@link https://developer.wordpress.org/themes/basics/conditional-tags/
 * Conditional Tags} article in the Theme Developer Handbook.
 *
 * @since 5.2.0
 *
 * @global WP_Query $wp_query WordPress Query object.
 *
 * @return bool Whether the query is for the Privacy Policy page.
 */
function is_privacy_policy() {
	global $wp_query;

return $wp_query->is_privacy_policy();
}

/**
 * Determines whether the query is for an existing month archive.
 *
 * For more information on this and similar theme functions, check out
 * the {@link https://developer.wordpress.org/themes/basics/conditional-tags/
 * Conditional Tags} article in the Theme Developer Handbook.
 *
 * @since 1.5.0
 *
 * @global WP_Query $wp_query WordPress Query object.
 *
 * @return bool Whether the query is for an existing month archive.
 */
function is_month() {
	global $wp_query;

return $wp_query->is_month();
}

/**
 * Determines whether the query is for an existing single page.
 *
 * If the $page parameter is specified, this function will additionally
 * check if the query is for one of the pages specified.
 *
 * For more information on this and similar theme functions, check out
 * the {@link https://developer.wordpress.org/themes/basics/conditional-tags/
 * Conditional Tags} article in the Theme Developer Handbook.
 *
 * @since 1.5.0
 *
 * @see is_single()
 * @see is_singular()
 * @global WP_Query $wp_query WordPress Query object.
 *
 * @param int|string|int[]|string[] $page Optional. Page ID, title, slug, or array of such
 *                                        to check against. Default empty.
 * @return bool Whether the query is for an existing single page.
 */
function is_page( $page = '' ) {
	global $wp_query;

return $wp_query->is_page( $page );
}

/**
 * Determines whether the query is for a paged result and not for the first page.
 *
 * For more information on this and similar theme functions, check out
 * the {@link https://developer.wordpress.org/themes/basics/conditional-tags/
 * Conditional Tags} article in the Theme Developer Handbook.
 *
 * @since 1.5.0
 *
 * @global WP_Query $wp_query WordPress Query object.
 *
 * @return bool Whether the query is for a paged result.
 */
function is_paged() {
	global $wp_query;

return $wp_query->is_paged();
}

/**
 * Determines whether the query is for a post or page preview.
 *
 * For more information on this and similar theme functions, check out
 * the {@link https://developer.wordpress.org/themes/basics/conditional-tags/
 * Conditional Tags} article in the Theme Developer Handbook.
 *
 * @since 2.0.0
 *
 * @global WP_Query $wp_query WordPress Query object.
 *
 * @return bool Whether the query is for a post or page preview.
 */
function is_preview() {
	global $wp_query;

return $wp_query->is_preview();
}

/**
 * Is the query for the robots.txt file?
 *
 * @since 2.1.0
 *
 * @global WP_Query $wp_query WordPress Query object.
 *
 * @return bool Whether the query is for the robots.txt file.
 */
function is_robots() {
	global $wp_query;

return $wp_query->is_robots();
}

/**
 * Is the query for the favicon.ico file?
 *
 * @since 5.4.0
 *
 * @global WP_Query $wp_query WordPress Query object.
 *
 * @return bool Whether the query is for the favicon.ico file.
 */
function is_favicon() {
	global $wp_query;

return $wp_query->is_favicon();
}

/**
 * Determines whether the query is for a search.
 *
 * For more information on this and similar theme functions, check out
 * the {@link https://developer.wordpress.org/themes/basics/conditional-tags/
 * Conditional Tags} article in the Theme Developer Handbook.
 *
 * @since 1.5.0
 *
 * @global WP_Query $wp_query WordPress Query object.
 *
 * @return bool Whether the query is for a search.
 */
function is_search() {
	global $wp_query;

return $wp_query->is_search();
}

/**
 * Determines whether the query is for an existing single post.
 *
 * Works for any post type, except attachments and pages
 *
 * If the $post parameter is specified, this function will additionally
 * check if the query is for one of the Posts specified.
 *
 * For more information on this and similar theme functions, check out
 * the {@link https://developer.wordpress.org/themes/basics/conditional-tags/
 * Conditional Tags} article in the Theme Developer Handbook.
 *
 * @since 1.5.0
 *
 * @see is_page()
 * @see is_singular()
 * @global WP_Query $wp_query WordPress Query object.
 *
 * @param int|string|int[]|string[] $post Optional. Post ID, title, slug, or array of such
 *                                        to check against. Default empty.
 * @return bool Whether the query is for an existing single post.
 */
function is_single( $post = '' ) {
	global $wp_query;

return $wp_query->is_single( $post );
}

/**
 * Determines whether the query is for an existing single post of any post type
 * (post, attachment, page, custom post types).
 *
 * If the $post_types parameter is specified, this function will additionally
 * check if the query is for one of the Posts Types specified.
 *
 * For more information on this and similar theme functions, check out
 * the {@link https://developer.wordpress.org/themes/basics/conditional-tags/
 * Conditional Tags} article in the Theme Developer Handbook.
 *
 * @since 1.5.0
 *
 * @see is_page()
 * @see is_single()
 * @global WP_Query $wp_query WordPress Query object.
 *
 * @param string|string[] $post_types Optional. Post type or array of post types
 *                                    to check against. Default empty.
 * @return bool Whether the query is for an existing single post
 *              or any of the given post types.
 */
function is_singular( $post_types = '' ) {
	global $wp_query;

return $wp_query->is_singular( $post_types );
}

/**
 * Determines whether the query is for a specific time.
 *
 * For more information on this and similar theme functions, check out
 * the {@link https://developer.wordpress.org/themes/basics/conditional-tags/
 * Conditional Tags} article in the Theme Developer Handbook.
 *
 * @since 1.5.0
 *
 * @global WP_Query $wp_query WordPress Query object.
 *
 * @return bool Whether the query is for a specific time.
 */
function is_time() {
	global $wp_query;

return $wp_query->is_time();
}

/**
 * Determines whether the query is for a trackback endpoint call.
 *
 * For more information on this and similar theme functions, check out
 * the {@link https://developer.wordpress.org/themes/basics/conditional-tags/
 * Conditional Tags} article in the Theme Developer Handbook.
 *
 * @since 1.5.0
 *
 * @global WP_Query $wp_query WordPress Query object.
 *
 * @return bool Whether the query is for a trackback endpoint call.
 */
function is_trackback() {
	global $wp_query;

return $wp_query->is_trackback();
}

/**
 * Determines whether the query is for an existing year archive.
 *
 * For more information on this and similar theme functions, check out
 * the {@link https://developer.wordpress.org/themes/basics/conditional-tags/
 * Conditional Tags} article in the Theme Developer Handbook.
 *
 * @since 1.5.0
 *
 * @global WP_Query $wp_query WordPress Query object.
 *
 * @return bool Whether the query is for an existing year archive.
 */
function is_year() {
	global $wp_query;

return $wp_query->is_year();
}

/**
 * Determines whether the query has resulted in a 404 (returns no results).
 *
 * For more information on this and similar theme functions, check out
 * the {@link https://developer.wordpress.org/themes/basics/conditional-tags/
 * Conditional Tags} article in the Theme Developer Handbook.
 *
 * @since 1.5.0
 *
 * @global WP_Query $wp_query WordPress Query object.
 *
 * @return bool Whether the query is a 404 error.
 */
function is_404() {
	global $wp_query;

return $wp_query->is_404();
}

/**
 * Is the query for an embedded post?
 *
 * @since 4.4.0
 *
 * @global WP_Query $wp_query WordPress Query object.
 *
 * @return bool Whether the query is for an embedded post.
 */
function is_embed() {
	global $wp_query;

return $wp_query->is_embed();
}

/**
 * Determines whether the query is the main query.
 *
 * For more information on this and similar theme functions, check out
 * the {@link https://developer.wordpress.org/themes/basics/conditional-tags/
 * Conditional Tags} article in the Theme Developer Handbook.
 *
 * @since 3.3.0
 *
 * @global WP_Query $wp_query WordPress Query object.
 *
 * @return bool Whether the query is the main query.
 */
function is_main_query() {
	global $wp_query;

if ( ! isset( $wp_query ) ) {
		_doing_it_wrong( __FUNCTION__, __( 'Conditional query tags do not work before the query is run. Before then, they always return false.' ), '6.1.0' );
		return false;
	}

if ( 'pre_get_posts' === current_filter() ) {
		_doing_it_wrong(
			__FUNCTION__,
			sprintf(
				/* translators: 1: pre_get_posts, 2: WP_Query->is_main_query(), 3: is_main_query(), 4: Documentation URL. */
				__( 'In %1$s, use the %2$s method, not the %3$s function. See %4$s.' ),
				'<code>pre_get_posts</code>',
				'<code>WP_Query->is_main_query()</code>',
				'<code>is_main_query()</code>',
				__( 'https://developer.wordpress.org/reference/functions/is_main_query/' )
			),
			'3.7.0'
		);
	}

return $wp_query->is_main_query();
}

/*
 * The Loop. Post loop control.
 */

/**
 * Determines whether current WordPress query has posts to loop over.
 *
 * @since 1.5.0
 *
 * @global WP_Query $wp_query WordPress Query object.
 *
 * @return bool True if posts are available, false if end of the loop.
 */
function have_posts() {
	global $wp_query;

if ( ! isset( $wp_query ) ) {
		return false;
	}

return $wp_query->have_posts();
}

/**
 * Determines whether the caller is in the Loop.
 *
 * For more information on this and similar theme functions, check out
 * the {@link https://developer.wordpress.org/themes/basics/conditional-tags/
 * Conditional Tags} article in the Theme Developer Handbook.
 *
 * @since 2.0.0
 *
 * @global WP_Query $wp_query WordPress Query object.
 *
 * @return bool True if caller is within loop, false if loop hasn't started or ended.
 */
function in_the_loop() {
	global $wp_query;

if ( ! isset( $wp_query ) ) {
		return false;
	}

return $wp_query->in_the_loop;
}

/**
 * Rewind the loop posts.
 *
 * @since 1.5.0
 *
 * @global WP_Query $wp_query WordPress Query object.
 */
function rewind_posts() {
	global $wp_query;

if ( ! isset( $wp_query ) ) {
		return;
	}

$wp_query->rewind_posts();
}

/**
 * Iterate the post index in the loop.
 *
 * @since 1.5.0
 *
 * @global WP_Query $wp_query WordPress Query object.
 */
function the_post() {
	global $wp_query;

if ( ! isset( $wp_query ) ) {
		return;
	}

$wp_query->the_post();
}

/*
 * Comments loop.
 */

/**
 * Determines whether current WordPress query has comments to loop over.
 *
 * @since 2.2.0
 *
 * @global WP_Query $wp_query WordPress Query object.
 *
 * @return bool True if comments are available, false if no more comments.
 */
function have_comments() {
	global $wp_query;

if ( ! isset( $wp_query ) ) {
		return false;
	}

return $wp_query->have_comments();
}

/**
 * Iterate comment index in the comment loop.
 *
 * @since 2.2.0
 *
 * @global WP_Query $wp_query WordPress Query object.
 */
function the_comment() {
	global $wp_query;

if ( ! isset( $wp_query ) ) {
		return;
	}

$wp_query->the_comment();
}

/**
 * Redirect old slugs to the correct permalink.
 *
 * Attempts to find the current slug from the past slugs.
 *
 * @since 2.1.0
 */
function wp_old_slug_redirect() {
	if ( is_404() && '' !== get_query_var( 'name' ) ) {
		// Guess the current post type based on the query vars.
		if ( get_query_var( 'post_type' ) ) {
			$post_type = get_query_var( 'post_type' );
		} elseif ( get_query_var( 'attachment' ) ) {
			$post_type = 'attachment';
		} elseif ( get_query_var( 'pagename' ) ) {
			$post_type = 'page';
		} else {
			$post_type = 'post';
		}

if ( is_array( $post_type ) ) {
			if ( count( $post_type ) > 1 ) {
				return;
			}
			$post_type = reset( $post_type );
		}

// Do not attempt redirect for hierarchical post types.
		if ( is_post_type_hierarchical( $post_type ) ) {
			return;
		}

$id = _find_post_by_old_slug( $post_type );

if ( ! $id ) {
			$id = _find_post_by_old_date( $post_type );
		}

/**
		 * Filters the old slug redirect post ID.
		 *
		 * @since 4.9.3
		 *
		 * @param int $id The redirect post ID.
		 */
		$id = apply_filters( 'old_slug_redirect_post_id', $id );

if ( ! $id ) {
			return;
		}

$link = get_permalink( $id );

if ( get_query_var( 'paged' ) > 1 ) {
			$link = user_trailingslashit( trailingslashit( $link ) . 'page/' . get_query_var( 'paged' ) );
		} elseif ( is_embed() ) {
			$link = user_trailingslashit( trailingslashit( $link ) . 'embed' );
		}

/**
		 * Filters the old slug redirect URL.
		 *
		 * @since 4.4.0
		 *
		 * @param string $link The redirect URL.
		 */
		$link = apply_filters( 'old_slug_redirect_url', $link );

if ( ! $link ) {
			return;
		}

wp_redirect( $link, 301 ); // Permanent redirect.
		exit;
	}
}

/**
 * Find the post ID for redirecting an old slug.
 *
 * @since 4.9.3
 * @access private
 *
 * @see wp_old_slug_redirect()
 * @global wpdb $wpdb WordPress database abstraction object.
 *
 * @param string $post_type The current post type based on the query vars.
 * @return int The Post ID.
 */
function _find_post_by_old_slug( $post_type ) {
	global $wpdb;

$query = $wpdb->prepare( "SELECT post_id FROM $wpdb->postmeta, $wpdb->posts WHERE ID = post_id AND post_type = %s AND meta_key = '_wp_old_slug' AND meta_value = %s", $post_type, get_query_var( 'name' ) );

/*
	 * If year, monthnum, or day have been specified, make our query more precise
	 * just in case there are multiple identical _wp_old_slug values.
	 */
	if ( get_query_var( 'year' ) ) {
		$query .= $wpdb->prepare( ' AND YEAR(post_date) = %d', get_query_var( 'year' ) );
	}
	if ( get_query_var( 'monthnum' ) ) {
		$query .= $wpdb->prepare( ' AND MONTH(post_date) = %d', get_query_var( 'monthnum' ) );
	}
	if ( get_query_var( 'day' ) ) {
		$query .= $wpdb->prepare( ' AND DAYOFMONTH(post_date) = %d', get_query_var( 'day' ) );
	}

$key          = md5( $query );
	$last_changed = wp_cache_get_last_changed( 'posts' );
	$cache_key    = "find_post_by_old_slug:$key";
	$cache        = wp_cache_get_salted( $cache_key, 'post-queries', $last_changed );
	if ( false !== $cache ) {
		$id = $cache;
	} else {
		$id = (int) $wpdb->get_var( $query );
		wp_cache_set_salted( $cache_key, $id, 'post-queries', $last_changed );
	}

return $id;
}

/**
 * Find the post ID for redirecting an old date.
 *
 * @since 4.9.3
 * @access private
 *
 * @see wp_old_slug_redirect()
 * @global wpdb $wpdb WordPress database abstraction object.
 *
 * @param string $post_type The current post type based on the query vars.
 * @return int The Post ID.
 */
function _find_post_by_old_date( $post_type ) {
	global $wpdb;

$date_query = '';
	if ( get_query_var( 'year' ) ) {
		$date_query .= $wpdb->prepare( ' AND YEAR(pm_date.meta_value) = %d', get_query_var( 'year' ) );
	}
	if ( get_query_var( 'monthnum' ) ) {
		$date_query .= $wpdb->prepare( ' AND MONTH(pm_date.meta_value) = %d', get_query_var( 'monthnum' ) );
	}
	if ( get_query_var( 'day' ) ) {
		$date_query .= $wpdb->prepare( ' AND DAYOFMONTH(pm_date.meta_value) = %d', get_query_var( 'day' ) );
	}

$id = 0;
	if ( $date_query ) {
		$query        = $wpdb->prepare( "SELECT post_id FROM $wpdb->postmeta AS pm_date, $wpdb->posts WHERE ID = post_id AND post_type = %s AND meta_key = '_wp_old_date' AND post_name = %s" . $date_query, $post_type, get_query_var( 'name' ) );
		$key          = md5( $query );
		$last_changed = wp_cache_get_last_changed( 'posts' );
		$cache_key    = "find_post_by_old_date:$key";
		$cache        = wp_cache_get_salted( $cache_key, 'post-queries', $last_changed );
		if ( false !== $cache ) {
			$id = $cache;
		} else {
			$id = (int) $wpdb->get_var( $query );
			if ( ! $id ) {
				// Check to see if an old slug matches the old date.
				$id = (int) $wpdb->get_var( $wpdb->prepare( "SELECT ID FROM $wpdb->posts, $wpdb->postmeta AS pm_slug, $wpdb->postmeta AS pm_date WHERE ID = pm_slug.post_id AND ID = pm_date.post_id AND post_type = %s AND pm_slug.meta_key = '_wp_old_slug' AND pm_slug.meta_value = %s AND pm_date.meta_key = '_wp_old_date'" . $date_query, $post_type, get_query_var( 'name' ) ) );
			}
			wp_cache_set_salted( $cache_key, $id, 'post-queries', $last_changed );
		}
	}

return $id;
}

/**
 * Set up global post data.
 *
 * @since 1.5.0
 * @since 4.4.0 Added the ability to pass a post ID to `$post`.
 *
 * @global WP_Query $wp_query WordPress Query object.
 *
 * @param WP_Post|object|int $post WP_Post instance or Post ID/object.
 * @return bool True when finished.
 */
function setup_postdata( $post ) {
	global $wp_query;

if ( ! empty( $wp_query ) && $wp_query instanceof WP_Query ) {
		return $wp_query->setup_postdata( $post );
	}

return false;
}

/**
 * Generates post data.
 *
 * @since 5.2.0
 *
 * @global WP_Query $wp_query WordPress Query object.
 *
 * @param WP_Post|object|int $post WP_Post instance or Post ID/object.
 * @return array|false Elements of post, or false on failure.
 */
function generate_postdata( $post ) {
	global $wp_query;

if ( ! empty( $wp_query ) && $wp_query instanceof WP_Query ) {
		return $wp_query->generate_postdata( $post );
	}

return false;
}

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