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Edit File : class-wp-customize-setting.php \| Size : 27.59 KB
<?php /** * WordPress Customize Setting classes * * @package WordPress * @subpackage Customize * @since 3.4.0 / /* * Customize Setting class. * * Handles saving and sanitizing of settings. * * @since 3.4.0 * * @see WP_Customize_Manager / class WP_Customize_Setting { /* * Customizer bootstrap instance. * * @since 3.4.0 * @var WP_Customize_Manager / public $manager; /* * Unique string identifier for the setting. * * @since 3.4.0 * @var string / public $id; /* * Type of customize settings. * * @since 3.4.0 * @var string / public $type = 'theme_mod'; /* * Capability required to edit this setting. * * @since 3.4.0 * @var string\|array / public $capability = 'edit_theme_options'; /* * Feature a theme is required to support to enable this setting. * * @since 3.4.0 * @var string / public $theme_supports = ''; /* * The default value for the setting. * * @since 3.4.0 * @var string / public $default = ''; /* * Options for rendering the live preview of changes in Theme Customizer. * * Set this value to 'postMessage' to enable a custom Javascript handler to render changes to this setting * as opposed to reloading the whole page. * * @link https://developer.wordpress.org/themes/customize-api * * @since 3.4.0 * @var string / public $transport = 'refresh'; /* * Server-side validation callback for the setting's value. * * @since 4.6.0 * @var callable / public $validate_callback = ''; /* * Callback to filter a Customize setting value in un-slashed form. * * @since 3.4.0 * @var callable / public $sanitize_callback = ''; /* * Callback to convert a Customize PHP setting value to a value that is JSON serializable. * * @since 3.4.0 * @var string / public $sanitize_js_callback = ''; /* * Whether or not the setting is initially dirty when created. * * This is used to ensure that a setting will be sent from the pane to the * preview when loading the Customizer. Normally a setting only is synced to * the preview if it has been changed. This allows the setting to be sent * from the start. * * @since 4.2.0 * @var bool / public $dirty = false; /* * ID Data. * * @since 3.4.0 * @var array / protected $id_data = array(); /* * Whether or not preview() was called. * * @since 4.4.0 * @var bool / protected $is_previewed = false; /* * Cache of multidimensional values to improve performance. * * @since 4.4.0 * @var array / protected static $aggregated_multidimensionals = array(); /* * Whether the multidimensional setting is aggregated. * * @since 4.4.0 * @var bool / protected $is_multidimensional_aggregated = false; /* * Constructor. * * Any supplied $args override class property defaults. * * @since 3.4.0 * * @param WP_Customize_Manager $manager * @param string $id An specific ID of the setting. Can be a * theme mod or option name. * @param array $args Setting arguments. / public function __construct( $manager, $id, $args = array() ) { $keys = array_keys( get_object_vars( $this ) ); foreach ( $keys as $key ) { if ( isset( $args[ $key ] ) ) { $this->$key = $args[ $key ]; } } $this->manager = $manager; $this->id = $id; // Parse the ID for array keys. $this->id_data['keys'] = preg_split( '/\[/', str_replace( ']', '', $this->id ) ); $this->id_data['base'] = array_shift( $this->id_data['keys'] ); // Rebuild the ID. $this->id = $this->id_data['base']; if ( ! empty( $this->id_data['keys'] ) ) { $this->id .= '[' . implode( '][', $this->id_data['keys'] ) . ']'; } if ( $this->validate_callback ) { add_filter( "customize_validate_{$this->id}", $this->validate_callback, 10, 3 ); } if ( $this->sanitize_callback ) { add_filter( "customize_sanitize_{$this->id}", $this->sanitize_callback, 10, 2 ); } if ( $this->sanitize_js_callback ) { add_filter( "customize_sanitize_js_{$this->id}", $this->sanitize_js_callback, 10, 2 ); } if ( 'option' === $this->type \|\| 'theme_mod' === $this->type ) { // Other setting types can opt-in to aggregate multidimensional explicitly. $this->aggregate_multidimensional(); // Allow option settings to indicate whether they should be autoloaded. if ( 'option' === $this->type && isset( $args['autoload'] ) ) { self::$aggregated_multidimensionals[ $this->type ][ $this->id_data['base'] ]['autoload'] = $args['autoload']; } } } /* * Get parsed ID data for multidimensional setting. * * @since 4.4.0 * * @return array { * ID data for multidimensional setting. * * @type string $base ID base * @type array $keys Keys for multidimensional array. * } / final public function id_data() { return $this->id_data; } /* * Set up the setting for aggregated multidimensional values. * * When a multidimensional setting gets aggregated, all of its preview and update * calls get combined into one call, greatly improving performance. * * @since 4.4.0 / protected function aggregate_multidimensional() { $id_base = $this->id_data['base']; if ( ! isset( self::$aggregated_multidimensionals[ $this->type ] ) ) { self::$aggregated_multidimensionals[ $this->type ] = array(); } if ( ! isset( self::$aggregated_multidimensionals[ $this->type ][ $id_base ] ) ) { self::$aggregated_multidimensionals[ $this->type ][ $id_base ] = array( 'previewed_instances' => array(), // Calling preview() will add the $setting to the array. 'preview_applied_instances' => array(), // Flags for which settings have had their values applied. 'root_value' => $this->get_root_value( array() ), // Root value for initial state, manipulated by preview and update calls. ); } if ( ! empty( $this->id_data['keys'] ) ) { // Note the preview-applied flag is cleared at priority 9 to ensure it is cleared before a deferred-preview runs. add_action( "customize_post_value_set_{$this->id}", array( $this, '_clear_aggregated_multidimensional_preview_applied_flag' ), 9 ); $this->is_multidimensional_aggregated = true; } } /* * Reset `$aggregated_multidimensionals` static variable. * * This is intended only for use by unit tests. * * @since 4.5.0 * @ignore / static public function reset_aggregated_multidimensionals() { self::$aggregated_multidimensionals = array(); } /* * The ID for the current site when the preview() method was called. * * @since 4.2.0 * @var int / protected $_previewed_blog_id; /* * Return true if the current site is not the same as the previewed site. * * @since 4.2.0 * * @return bool If preview() has been called. / public function is_current_blog_previewed() { if ( ! isset( $this->_previewed_blog_id ) ) { return false; } return ( get_current_blog_id() === $this->_previewed_blog_id ); } /* * Original non-previewed value stored by the preview method. * * @see WP_Customize_Setting::preview() * @since 4.1.1 * @var mixed / protected $_original_value; /* * Add filters to supply the setting's value when accessed. * * If the setting already has a pre-existing value and there is no incoming * post value for the setting, then this method will short-circuit since * there is no change to preview. * * @since 3.4.0 * @since 4.4.0 Added boolean return value. * * @return bool False when preview short-circuits due no change needing to be previewed. / public function preview() { if ( ! isset( $this->_previewed_blog_id ) ) { $this->_previewed_blog_id = get_current_blog_id(); } // Prevent re-previewing an already-previewed setting. if ( $this->is_previewed ) { return true; } $id_base = $this->id_data['base']; $is_multidimensional = ! empty( $this->id_data['keys'] ); $multidimensional_filter = array( $this, '_multidimensional_preview_filter' ); / * Check if the setting has a pre-existing value (an isset check), * and if doesn't have any incoming post value. If both checks are true, * then the preview short-circuits because there is nothing that needs * to be previewed. / $undefined = new stdClass(); $needs_preview = ( $undefined !== $this->post_value( $undefined ) ); $value = null; // Since no post value was defined, check if we have an initial value set. if ( ! $needs_preview ) { if ( $this->is_multidimensional_aggregated ) { $root = self::$aggregated_multidimensionals[ $this->type ][ $id_base ]['root_value']; $value = $this->multidimensional_get( $root, $this->id_data['keys'], $undefined ); } else { $default = $this->default; $this->default = $undefined; // Temporarily set default to undefined so we can detect if existing value is set. $value = $this->value(); $this->default = $default; } $needs_preview = ( $undefined === $value ); // Because the default needs to be supplied. } // If the setting does not need previewing now, defer to when it has a value to preview. if ( ! $needs_preview ) { if ( ! has_action( "customize_post_value_set_{$this->id}", array( $this, 'preview' ) ) ) { add_action( "customize_post_value_set_{$this->id}", array( $this, 'preview' ) ); } return false; } switch ( $this->type ) { case 'theme_mod': if ( ! $is_multidimensional ) { add_filter( "theme_mod_{$id_base}", array( $this, '_preview_filter' ) ); } else { if ( empty( self::$aggregated_multidimensionals[ $this->type ][ $id_base ]['previewed_instances'] ) ) { // Only add this filter once for this ID base. add_filter( "theme_mod_{$id_base}", $multidimensional_filter ); } self::$aggregated_multidimensionals[ $this->type ][ $id_base ]['previewed_instances'][ $this->id ] = $this; } break; case 'option': if ( ! $is_multidimensional ) { add_filter( "pre_option_{$id_base}", array( $this, '_preview_filter' ) ); } else { if ( empty( self::$aggregated_multidimensionals[ $this->type ][ $id_base ]['previewed_instances'] ) ) { // Only add these filters once for this ID base. add_filter( "option_{$id_base}", $multidimensional_filter ); add_filter( "default_option_{$id_base}", $multidimensional_filter ); } self::$aggregated_multidimensionals[ $this->type ][ $id_base ]['previewed_instances'][ $this->id ] = $this; } break; default: /* * Fires when the WP_Customize_Setting::preview() method is called for settings * not handled as theme_mods or options. * * The dynamic portion of the hook name, `$this->id`, refers to the setting ID. * * @since 3.4.0 * * @param WP_Customize_Setting $this WP_Customize_Setting instance. / do_action( "customize_preview_{$this->id}", $this ); /* * Fires when the WP_Customize_Setting::preview() method is called for settings * not handled as theme_mods or options. * * The dynamic portion of the hook name, `$this->type`, refers to the setting type. * * @since 4.1.0 * * @param WP_Customize_Setting $this WP_Customize_Setting instance. / do_action( "customize_preview_{$this->type}", $this ); } $this->is_previewed = true; return true; } /* * Clear out the previewed-applied flag for a multidimensional-aggregated value whenever its post value is updated. * * This ensures that the new value will get sanitized and used the next time * that `WP_Customize_Setting::_multidimensional_preview_filter()` * is called for this setting. * * @since 4.4.0 * * @see WP_Customize_Manager::set_post_value() * @see WP_Customize_Setting::_multidimensional_preview_filter() / final public function _clear_aggregated_multidimensional_preview_applied_flag() { unset( self::$aggregated_multidimensionals[ $this->type ][ $this->id_data['base'] ]['preview_applied_instances'][ $this->id ] ); } /* * Callback function to filter non-multidimensional theme mods and options. * * If switch_to_blog() was called after the preview() method, and the current * site is now not the same site, then this method does a no-op and returns * the original value. * * @since 3.4.0 * * @param mixed $original Old value. * @return mixed New or old value. / public function _preview_filter( $original ) { if ( ! $this->is_current_blog_previewed() ) { return $original; } $undefined = new stdClass(); // Symbol hack. $post_value = $this->post_value( $undefined ); if ( $undefined !== $post_value ) { $value = $post_value; } else { / * Note that we don't use $original here because preview() will * not add the filter in the first place if it has an initial value * and there is no post value. / $value = $this->default; } return $value; } /* * Callback function to filter multidimensional theme mods and options. * * For all multidimensional settings of a given type, the preview filter for * the first setting previewed will be used to apply the values for the others. * * @since 4.4.0 * * @see WP_Customize_Setting::$aggregated_multidimensionals * @param mixed $original Original root value. * @return mixed New or old value. / final public function _multidimensional_preview_filter( $original ) { if ( ! $this->is_current_blog_previewed() ) { return $original; } $id_base = $this->id_data['base']; // If no settings have been previewed yet (which should not be the case, since $this is), just pass through the original value. if ( empty( self::$aggregated_multidimensionals[ $this->type ][ $id_base ]['previewed_instances'] ) ) { return $original; } foreach ( self::$aggregated_multidimensionals[ $this->type ][ $id_base ]['previewed_instances'] as $previewed_setting ) { // Skip applying previewed value for any settings that have already been applied. if ( ! empty( self::$aggregated_multidimensionals[ $this->type ][ $id_base ]['preview_applied_instances'][ $previewed_setting->id ] ) ) { continue; } // Do the replacements of the posted/default sub value into the root value. $value = $previewed_setting->post_value( $previewed_setting->default ); $root = self::$aggregated_multidimensionals[ $previewed_setting->type ][ $id_base ]['root_value']; $root = $previewed_setting->multidimensional_replace( $root, $previewed_setting->id_data['keys'], $value ); self::$aggregated_multidimensionals[ $previewed_setting->type ][ $id_base ]['root_value'] = $root; // Mark this setting having been applied so that it will be skipped when the filter is called again. self::$aggregated_multidimensionals[ $previewed_setting->type ][ $id_base ]['preview_applied_instances'][ $previewed_setting->id ] = true; } return self::$aggregated_multidimensionals[ $this->type ][ $id_base ]['root_value']; } /* * Checks user capabilities and theme supports, and then saves * the value of the setting. * * @since 3.4.0 * * @return false\|void False if cap check fails or value isn't set or is invalid. / final public function save() { $value = $this->post_value(); if ( ! $this->check_capabilities() \|\| ! isset( $value ) ) { return false; } $id_base = $this->id_data['base']; /* * Fires when the WP_Customize_Setting::save() method is called. * * The dynamic portion of the hook name, `$id_base` refers to * the base slug of the setting name. * * @since 3.4.0 * * @param WP_Customize_Setting $this WP_Customize_Setting instance. / do_action( "customize_save_{$id_base}", $this ); $this->update( $value ); } /* * Fetch and sanitize the $_POST value for the setting. * * During a save request prior to save, post_value() provides the new value while value() does not. * * @since 3.4.0 * * @param mixed $default A default value which is used as a fallback. Default is null. * @return mixed The default value on failure, otherwise the sanitized and validated value. / final public function post_value( $default = null ) { return $this->manager->post_value( $this, $default ); } /* * Sanitize an input. * * @since 3.4.0 * * @param string\|array $value The value to sanitize. * @return string\|array\|null\|WP_Error Sanitized value, or `null`/`WP_Error` if invalid. / public function sanitize( $value ) { /* * Filters a Customize setting value in un-slashed form. * * @since 3.4.0 * * @param mixed $value Value of the setting. * @param WP_Customize_Setting $this WP_Customize_Setting instance. / return apply_filters( "customize_sanitize_{$this->id}", $value, $this ); } /* * Validates an input. * * @since 4.6.0 * * @see WP_REST_Request::has_valid_params() * * @param mixed $value Value to validate. * @return true\|WP_Error True if the input was validated, otherwise WP_Error. / public function validate( $value ) { if ( is_wp_error( $value ) ) { return $value; } if ( is_null( $value ) ) { return new WP_Error( 'invalid_value', __( 'Invalid value.' ) ); } $validity = new WP_Error(); /* * Validates a Customize setting value. * * Plugins should amend the `$validity` object via its `WP_Error::add()` method. * * The dynamic portion of the hook name, `$this->ID`, refers to the setting ID. * * @since 4.6.0 * * @param WP_Error $validity Filtered from `true` to `WP_Error` when invalid. * @param mixed $value Value of the setting. * @param WP_Customize_Setting $this WP_Customize_Setting instance. / $validity = apply_filters( "customize_validate_{$this->id}", $validity, $value, $this ); if ( is_wp_error( $validity ) && ! $validity->has_errors() ) { $validity = true; } return $validity; } /* * Get the root value for a setting, especially for multidimensional ones. * * @since 4.4.0 * * @param mixed $default Value to return if root does not exist. * @return mixed / protected function get_root_value( $default = null ) { $id_base = $this->id_data['base']; if ( 'option' === $this->type ) { return get_option( $id_base, $default ); } elseif ( 'theme_mod' === $this->type ) { return get_theme_mod( $id_base, $default ); } else { / * Any WP_Customize_Setting subclass implementing aggregate multidimensional * will need to override this method to obtain the data from the appropriate * location. / return $default; } } /* * Set the root value for a setting, especially for multidimensional ones. * * @since 4.4.0 * * @param mixed $value Value to set as root of multidimensional setting. * @return bool Whether the multidimensional root was updated successfully. / protected function set_root_value( $value ) { $id_base = $this->id_data['base']; if ( 'option' === $this->type ) { $autoload = true; if ( isset( self::$aggregated_multidimensionals[ $this->type ][ $this->id_data['base'] ]['autoload'] ) ) { $autoload = self::$aggregated_multidimensionals[ $this->type ][ $this->id_data['base'] ]['autoload']; } return update_option( $id_base, $value, $autoload ); } elseif ( 'theme_mod' === $this->type ) { set_theme_mod( $id_base, $value ); return true; } else { / * Any WP_Customize_Setting subclass implementing aggregate multidimensional * will need to override this method to obtain the data from the appropriate * location. / return false; } } /* * Save the value of the setting, using the related API. * * @since 3.4.0 * * @param mixed $value The value to update. * @return bool The result of saving the value. / protected function update( $value ) { $id_base = $this->id_data['base']; if ( 'option' === $this->type \|\| 'theme_mod' === $this->type ) { if ( ! $this->is_multidimensional_aggregated ) { return $this->set_root_value( $value ); } else { $root = self::$aggregated_multidimensionals[ $this->type ][ $id_base ]['root_value']; $root = $this->multidimensional_replace( $root, $this->id_data['keys'], $value ); self::$aggregated_multidimensionals[ $this->type ][ $id_base ]['root_value'] = $root; return $this->set_root_value( $root ); } } else { /* * Fires when the WP_Customize_Setting::update() method is called for settings * not handled as theme_mods or options. * * The dynamic portion of the hook name, `$this->type`, refers to the type of setting. * * @since 3.4.0 * * @param mixed $value Value of the setting. * @param WP_Customize_Setting $this WP_Customize_Setting instance. / do_action( "customize_update_{$this->type}", $value, $this ); return has_action( "customize_update_{$this->type}" ); } } /* * Deprecated method. * * @since 3.4.0 * @deprecated 4.4.0 Deprecated in favor of update() method. / protected function _update_theme_mod() { _deprecated_function( __METHOD__, '4.4.0', __CLASS__ . '::update()' ); } /* * Deprecated method. * * @since 3.4.0 * @deprecated 4.4.0 Deprecated in favor of update() method. / protected function _update_option() { _deprecated_function( __METHOD__, '4.4.0', __CLASS__ . '::update()' ); } /* * Fetch the value of the setting. * * @since 3.4.0 * * @return mixed The value. / public function value() { $id_base = $this->id_data['base']; $is_core_type = ( 'option' === $this->type \|\| 'theme_mod' === $this->type ); if ( ! $is_core_type && ! $this->is_multidimensional_aggregated ) { // Use post value if previewed and a post value is present. if ( $this->is_previewed ) { $value = $this->post_value( null ); if ( null !== $value ) { return $value; } } $value = $this->get_root_value( $this->default ); /* * Filters a Customize setting value not handled as a theme_mod or option. * * The dynamic portion of the hook name, `$id_base`, refers to * the base slug of the setting name, initialized from `$this->id_data['base']`. * * For settings handled as theme_mods or options, see those corresponding * functions for available hooks. * * @since 3.4.0 * @since 4.6.0 Added the `$this` setting instance as the second parameter. * * @param mixed $default The setting default value. Default empty. * @param WP_Customize_Setting $this The setting instance. / $value = apply_filters( "customize_value_{$id_base}", $value, $this ); } elseif ( $this->is_multidimensional_aggregated ) { $root_value = self::$aggregated_multidimensionals[ $this->type ][ $id_base ]['root_value']; $value = $this->multidimensional_get( $root_value, $this->id_data['keys'], $this->default ); // Ensure that the post value is used if the setting is previewed, since preview filters aren't applying on cached $root_value. if ( $this->is_previewed ) { $value = $this->post_value( $value ); } } else { $value = $this->get_root_value( $this->default ); } return $value; } /* * Sanitize the setting's value for use in JavaScript. * * @since 3.4.0 * * @return mixed The requested escaped value. / public function js_value() { /* * Filters a Customize setting value for use in JavaScript. * * The dynamic portion of the hook name, `$this->id`, refers to the setting ID. * * @since 3.4.0 * * @param mixed $value The setting value. * @param WP_Customize_Setting $this WP_Customize_Setting instance. / $value = apply_filters( "customize_sanitize_js_{$this->id}", $this->value(), $this ); if ( is_string( $value ) ) { return html_entity_decode( $value, ENT_QUOTES, 'UTF-8' ); } return $value; } /* * Retrieves the data to export to the client via JSON. * * @since 4.6.0 * * @return array Array of parameters passed to JavaScript. / public function json() { return array( 'value' => $this->js_value(), 'transport' => $this->transport, 'dirty' => $this->dirty, 'type' => $this->type, ); } /* * Validate user capabilities whether the theme supports the setting. * * @since 3.4.0 * * @return bool False if theme doesn't support the setting or user can't change setting, otherwise true. / final public function check_capabilities() { if ( $this->capability && ! call_user_func_array( 'current_user_can', (array) $this->capability ) ) { return false; } if ( $this->theme_supports && ! call_user_func_array( 'current_theme_supports', (array) $this->theme_supports ) ) { return false; } return true; } /* * Multidimensional helper function. * * @since 3.4.0 * * @param $root * @param $keys * @param bool $create Default is false. * @return array\|void Keys are 'root', 'node', and 'key'. / final protected function multidimensional( &$root, $keys, $create = false ) { if ( $create && empty( $root ) ) { $root = array(); } if ( ! isset( $root ) \|\| empty( $keys ) ) { return; } $last = array_pop( $keys ); $node = &$root; foreach ( $keys as $key ) { if ( $create && ! isset( $node[ $key ] ) ) { $node[ $key ] = array(); } if ( ! is_array( $node ) \|\| ! isset( $node[ $key ] ) ) { return; } $node = &$node[ $key ]; } if ( $create ) { if ( ! is_array( $node ) ) { // account for an array overriding a string or object value $node = array(); } if ( ! isset( $node[ $last ] ) ) { $node[ $last ] = array(); } } if ( ! isset( $node[ $last ] ) ) { return; } return array( 'root' => &$root, 'node' => &$node, 'key' => $last, ); } /* * Will attempt to replace a specific value in a multidimensional array. * * @since 3.4.0 * * @param $root * @param $keys * @param mixed $value The value to update. * @return mixed / final protected function multidimensional_replace( $root, $keys, $value ) { if ( ! isset( $value ) ) { return $root; } elseif ( empty( $keys ) ) { // If there are no keys, we're replacing the root. return $value; } $result = $this->multidimensional( $root, $keys, true ); if ( isset( $result ) ) { $result['node'][ $result['key'] ] = $value; } return $root; } /* * Will attempt to fetch a specific value from a multidimensional array. * * @since 3.4.0 * * @param $root * @param $keys * @param mixed $default A default value which is used as a fallback. Default is null. * @return mixed The requested value or the default value. / final protected function multidimensional_get( $root, $keys, $default = null ) { if ( empty( $keys ) ) { // If there are no keys, test the root. return isset( $root ) ? $root : $default; } $result = $this->multidimensional( $root, $keys ); return isset( $result ) ? $result['node'][ $result['key'] ] : $default; } /* * Will attempt to check if a specific value in a multidimensional array is set. * * @since 3.4.0 * * @param $root * @param $keys * @return bool True if value is set, false if not. / final protected function multidimensional_isset( $root, $keys ) { $result = $this->multidimensional_get( $root, $keys ); return isset( $result ); } } /* * WP_Customize_Filter_Setting class. / require_once( ABSPATH . WPINC . '/customize/class-wp-customize-filter-setting.php' ); /* * WP_Customize_Header_Image_Setting class. / require_once( ABSPATH . WPINC . '/customize/class-wp-customize-header-image-setting.php' ); /* * WP_Customize_Background_Image_Setting class. / require_once( ABSPATH . WPINC . '/customize/class-wp-customize-background-image-setting.php' ); /* * WP_Customize_Nav_Menu_Item_Setting class. / require_once( ABSPATH . WPINC . '/customize/class-wp-customize-nav-menu-item-setting.php' ); /* * WP_Customize_Nav_Menu_Setting class. */ require_once( ABSPATH . WPINC . '/customize/class-wp-customize-nav-menu-setting.php' ); Back

Edit File : class-wp-customize-setting.php | Size : 27.59 KB

<?php
/**
 * WordPress Customize Setting classes
 *
 * @package WordPress
 * @subpackage Customize
 * @since 3.4.0
 */

/**
 * Customize Setting class.
 *
 * Handles saving and sanitizing of settings.
 *
 * @since 3.4.0
 *
 * @see WP_Customize_Manager
 */
class WP_Customize_Setting {
	/**
	 * Customizer bootstrap instance.
	 *
	 * @since 3.4.0
	 * @var WP_Customize_Manager
	 */
	public $manager;

/**
	 * Unique string identifier for the setting.
	 *
	 * @since 3.4.0
	 * @var string
	 */
	public $id;

/**
	 * Type of customize settings.
	 *
	 * @since 3.4.0
	 * @var string
	 */
	public $type = 'theme_mod';

/**
	 * Capability required to edit this setting.
	 *
	 * @since 3.4.0
	 * @var string|array
	 */
	public $capability = 'edit_theme_options';

/**
	 * Feature a theme is required to support to enable this setting.
	 *
	 * @since 3.4.0
	 * @var string
	 */
	public $theme_supports = '';

/**
	 * The default value for the setting.
	 *
	 * @since 3.4.0
	 * @var string
	 */
	public $default = '';

/**
	 * Options for rendering the live preview of changes in Theme Customizer.
	 *
	 * Set this value to 'postMessage' to enable a custom Javascript handler to render changes to this setting
	 * as opposed to reloading the whole page.
	 *
	 * @link https://developer.wordpress.org/themes/customize-api
	 *
	 * @since 3.4.0
	 * @var string
	 */
	public $transport = 'refresh';

/**
	 * Server-side validation callback for the setting's value.
	 *
	 * @since 4.6.0
	 * @var callable
	 */
	public $validate_callback = '';

/**
	 * Callback to filter a Customize setting value in un-slashed form.
	 *
	 * @since 3.4.0
	 * @var callable
	 */
	public $sanitize_callback = '';

/**
	 * Callback to convert a Customize PHP setting value to a value that is JSON serializable.
	 *
	 * @since 3.4.0
	 * @var string
	 */
	public $sanitize_js_callback = '';

/**
	 * Whether or not the setting is initially dirty when created.
	 *
	 * This is used to ensure that a setting will be sent from the pane to the
	 * preview when loading the Customizer. Normally a setting only is synced to
	 * the preview if it has been changed. This allows the setting to be sent
	 * from the start.
	 *
	 * @since 4.2.0
	 * @var bool
	 */
	public $dirty = false;

/**
	 * ID Data.
	 *
	 * @since 3.4.0
	 * @var array
	 */
	protected $id_data = array();

/**
	 * Whether or not preview() was called.
	 *
	 * @since 4.4.0
	 * @var bool
	 */
	protected $is_previewed = false;

/**
	 * Cache of multidimensional values to improve performance.
	 *
	 * @since 4.4.0
	 * @var array
	 */
	protected static $aggregated_multidimensionals = array();

/**
	 * Whether the multidimensional setting is aggregated.
	 *
	 * @since 4.4.0
	 * @var bool
	 */
	protected $is_multidimensional_aggregated = false;

/**
	 * Constructor.
	 *
	 * Any supplied $args override class property defaults.
	 *
	 * @since 3.4.0
	 *
	 * @param WP_Customize_Manager $manager
	 * @param string               $id      An specific ID of the setting. Can be a
	 *                                      theme mod or option name.
	 * @param array                $args    Setting arguments.
	 */
	public function __construct( $manager, $id, $args = array() ) {
		$keys = array_keys( get_object_vars( $this ) );
		foreach ( $keys as $key ) {
			if ( isset( $args[ $key ] ) ) {
				$this->$key = $args[ $key ];
			}
		}

$this->manager = $manager;
		$this->id      = $id;

// Parse the ID for array keys.
		$this->id_data['keys'] = preg_split( '/\[/', str_replace( ']', '', $this->id ) );
		$this->id_data['base'] = array_shift( $this->id_data['keys'] );

// Rebuild the ID.
		$this->id = $this->id_data['base'];
		if ( ! empty( $this->id_data['keys'] ) ) {
			$this->id .= '[' . implode( '][', $this->id_data['keys'] ) . ']';
		}

if ( $this->validate_callback ) {
			add_filter( "customize_validate_{$this->id}", $this->validate_callback, 10, 3 );
		}
		if ( $this->sanitize_callback ) {
			add_filter( "customize_sanitize_{$this->id}", $this->sanitize_callback, 10, 2 );
		}
		if ( $this->sanitize_js_callback ) {
			add_filter( "customize_sanitize_js_{$this->id}", $this->sanitize_js_callback, 10, 2 );
		}

if ( 'option' === $this->type || 'theme_mod' === $this->type ) {
			// Other setting types can opt-in to aggregate multidimensional explicitly.
			$this->aggregate_multidimensional();

// Allow option settings to indicate whether they should be autoloaded.
			if ( 'option' === $this->type && isset( $args['autoload'] ) ) {
				self::$aggregated_multidimensionals[ $this->type ][ $this->id_data['base'] ]['autoload'] = $args['autoload'];
			}
		}
	}

/**
	 * Get parsed ID data for multidimensional setting.
	 *
	 * @since 4.4.0
	 *
	 * @return array {
	 *     ID data for multidimensional setting.
	 *
	 *     @type string $base ID base
	 *     @type array  $keys Keys for multidimensional array.
	 * }
	 */
	final public function id_data() {
		return $this->id_data;
	}

/**
	 * Set up the setting for aggregated multidimensional values.
	 *
	 * When a multidimensional setting gets aggregated, all of its preview and update
	 * calls get combined into one call, greatly improving performance.
	 *
	 * @since 4.4.0
	 */
	protected function aggregate_multidimensional() {
		$id_base = $this->id_data['base'];
		if ( ! isset( self::$aggregated_multidimensionals[ $this->type ] ) ) {
			self::$aggregated_multidimensionals[ $this->type ] = array();
		}
		if ( ! isset( self::$aggregated_multidimensionals[ $this->type ][ $id_base ] ) ) {
			self::$aggregated_multidimensionals[ $this->type ][ $id_base ] = array(
				'previewed_instances'       => array(), // Calling preview() will add the $setting to the array.
				'preview_applied_instances' => array(), // Flags for which settings have had their values applied.
				'root_value'                => $this->get_root_value( array() ), // Root value for initial state, manipulated by preview and update calls.
			);
		}

if ( ! empty( $this->id_data['keys'] ) ) {
			// Note the preview-applied flag is cleared at priority 9 to ensure it is cleared before a deferred-preview runs.
			add_action( "customize_post_value_set_{$this->id}", array( $this, '_clear_aggregated_multidimensional_preview_applied_flag' ), 9 );
			$this->is_multidimensional_aggregated = true;
		}
	}

/**
	 * Reset `$aggregated_multidimensionals` static variable.
	 *
	 * This is intended only for use by unit tests.
	 *
	 * @since 4.5.0
	 * @ignore
	 */
	static public function reset_aggregated_multidimensionals() {
		self::$aggregated_multidimensionals = array();
	}

/**
	 * The ID for the current site when the preview() method was called.
	 *
	 * @since 4.2.0
	 * @var int
	 */
	protected $_previewed_blog_id;

/**
	 * Return true if the current site is not the same as the previewed site.
	 *
	 * @since 4.2.0
	 *
	 * @return bool If preview() has been called.
	 */
	public function is_current_blog_previewed() {
		if ( ! isset( $this->_previewed_blog_id ) ) {
			return false;
		}
		return ( get_current_blog_id() === $this->_previewed_blog_id );
	}

/**
	 * Original non-previewed value stored by the preview method.
	 *
	 * @see WP_Customize_Setting::preview()
	 * @since 4.1.1
	 * @var mixed
	 */
	protected $_original_value;

/**
	 * Add filters to supply the setting's value when accessed.
	 *
	 * If the setting already has a pre-existing value and there is no incoming
	 * post value for the setting, then this method will short-circuit since
	 * there is no change to preview.
	 *
	 * @since 3.4.0
	 * @since 4.4.0 Added boolean return value.
	 *
	 * @return bool False when preview short-circuits due no change needing to be previewed.
	 */
	public function preview() {
		if ( ! isset( $this->_previewed_blog_id ) ) {
			$this->_previewed_blog_id = get_current_blog_id();
		}

// Prevent re-previewing an already-previewed setting.
		if ( $this->is_previewed ) {
			return true;
		}

$id_base                 = $this->id_data['base'];
		$is_multidimensional     = ! empty( $this->id_data['keys'] );
		$multidimensional_filter = array( $this, '_multidimensional_preview_filter' );

/*
		 * Check if the setting has a pre-existing value (an isset check),
		 * and if doesn't have any incoming post value. If both checks are true,
		 * then the preview short-circuits because there is nothing that needs
		 * to be previewed.
		 */
		$undefined     = new stdClass();
		$needs_preview = ( $undefined !== $this->post_value( $undefined ) );
		$value         = null;

// Since no post value was defined, check if we have an initial value set.
		if ( ! $needs_preview ) {
			if ( $this->is_multidimensional_aggregated ) {
				$root  = self::$aggregated_multidimensionals[ $this->type ][ $id_base ]['root_value'];
				$value = $this->multidimensional_get( $root, $this->id_data['keys'], $undefined );
			} else {
				$default       = $this->default;
				$this->default = $undefined; // Temporarily set default to undefined so we can detect if existing value is set.
				$value         = $this->value();
				$this->default = $default;
			}
			$needs_preview = ( $undefined === $value ); // Because the default needs to be supplied.
		}

// If the setting does not need previewing now, defer to when it has a value to preview.
		if ( ! $needs_preview ) {
			if ( ! has_action( "customize_post_value_set_{$this->id}", array( $this, 'preview' ) ) ) {
				add_action( "customize_post_value_set_{$this->id}", array( $this, 'preview' ) );
			}
			return false;
		}

switch ( $this->type ) {
			case 'theme_mod':
				if ( ! $is_multidimensional ) {
					add_filter( "theme_mod_{$id_base}", array( $this, '_preview_filter' ) );
				} else {
					if ( empty( self::$aggregated_multidimensionals[ $this->type ][ $id_base ]['previewed_instances'] ) ) {
						// Only add this filter once for this ID base.
						add_filter( "theme_mod_{$id_base}", $multidimensional_filter );
					}
					self::$aggregated_multidimensionals[ $this->type ][ $id_base ]['previewed_instances'][ $this->id ] = $this;
				}
				break;
			case 'option':
				if ( ! $is_multidimensional ) {
					add_filter( "pre_option_{$id_base}", array( $this, '_preview_filter' ) );
				} else {
					if ( empty( self::$aggregated_multidimensionals[ $this->type ][ $id_base ]['previewed_instances'] ) ) {
						// Only add these filters once for this ID base.
						add_filter( "option_{$id_base}", $multidimensional_filter );
						add_filter( "default_option_{$id_base}", $multidimensional_filter );
					}
					self::$aggregated_multidimensionals[ $this->type ][ $id_base ]['previewed_instances'][ $this->id ] = $this;
				}
				break;
			default:
				/**
				 * Fires when the WP_Customize_Setting::preview() method is called for settings
				 * not handled as theme_mods or options.
				 *
				 * The dynamic portion of the hook name, `$this->id`, refers to the setting ID.
				 *
				 * @since 3.4.0
				 *
				 * @param WP_Customize_Setting $this WP_Customize_Setting instance.
				 */
				do_action( "customize_preview_{$this->id}", $this );

/**
				 * Fires when the WP_Customize_Setting::preview() method is called for settings
				 * not handled as theme_mods or options.
				 *
				 * The dynamic portion of the hook name, `$this->type`, refers to the setting type.
				 *
				 * @since 4.1.0
				 *
				 * @param WP_Customize_Setting $this WP_Customize_Setting instance.
				 */
				do_action( "customize_preview_{$this->type}", $this );
		}

$this->is_previewed = true;

return true;
	}

/**
	 * Clear out the previewed-applied flag for a multidimensional-aggregated value whenever its post value is updated.
	 *
	 * This ensures that the new value will get sanitized and used the next time
	 * that `WP_Customize_Setting::_multidimensional_preview_filter()`
	 * is called for this setting.
	 *
	 * @since 4.4.0
	 *
	 * @see WP_Customize_Manager::set_post_value()
	 * @see WP_Customize_Setting::_multidimensional_preview_filter()
	 */
	final public function _clear_aggregated_multidimensional_preview_applied_flag() {
		unset( self::$aggregated_multidimensionals[ $this->type ][ $this->id_data['base'] ]['preview_applied_instances'][ $this->id ] );
	}

/**
	 * Callback function to filter non-multidimensional theme mods and options.
	 *
	 * If switch_to_blog() was called after the preview() method, and the current
	 * site is now not the same site, then this method does a no-op and returns
	 * the original value.
	 *
	 * @since 3.4.0
	 *
	 * @param mixed $original Old value.
	 * @return mixed New or old value.
	 */
	public function _preview_filter( $original ) {
		if ( ! $this->is_current_blog_previewed() ) {
			return $original;
		}

$undefined  = new stdClass(); // Symbol hack.
		$post_value = $this->post_value( $undefined );
		if ( $undefined !== $post_value ) {
			$value = $post_value;
		} else {
			/*
			 * Note that we don't use $original here because preview() will
			 * not add the filter in the first place if it has an initial value
			 * and there is no post value.
			 */
			$value = $this->default;
		}
		return $value;
	}

/**
	 * Callback function to filter multidimensional theme mods and options.
	 *
	 * For all multidimensional settings of a given type, the preview filter for
	 * the first setting previewed will be used to apply the values for the others.
	 *
	 * @since 4.4.0
	 *
	 * @see WP_Customize_Setting::$aggregated_multidimensionals
	 * @param mixed $original Original root value.
	 * @return mixed New or old value.
	 */
	final public function _multidimensional_preview_filter( $original ) {
		if ( ! $this->is_current_blog_previewed() ) {
			return $original;
		}

$id_base = $this->id_data['base'];

// If no settings have been previewed yet (which should not be the case, since $this is), just pass through the original value.
		if ( empty( self::$aggregated_multidimensionals[ $this->type ][ $id_base ]['previewed_instances'] ) ) {
			return $original;
		}

foreach ( self::$aggregated_multidimensionals[ $this->type ][ $id_base ]['previewed_instances'] as $previewed_setting ) {
			// Skip applying previewed value for any settings that have already been applied.
			if ( ! empty( self::$aggregated_multidimensionals[ $this->type ][ $id_base ]['preview_applied_instances'][ $previewed_setting->id ] ) ) {
				continue;
			}

// Do the replacements of the posted/default sub value into the root value.
			$value = $previewed_setting->post_value( $previewed_setting->default );
			$root  = self::$aggregated_multidimensionals[ $previewed_setting->type ][ $id_base ]['root_value'];
			$root  = $previewed_setting->multidimensional_replace( $root, $previewed_setting->id_data['keys'], $value );
			self::$aggregated_multidimensionals[ $previewed_setting->type ][ $id_base ]['root_value'] = $root;

// Mark this setting having been applied so that it will be skipped when the filter is called again.
			self::$aggregated_multidimensionals[ $previewed_setting->type ][ $id_base ]['preview_applied_instances'][ $previewed_setting->id ] = true;
		}

return self::$aggregated_multidimensionals[ $this->type ][ $id_base ]['root_value'];
	}

/**
	 * Checks user capabilities and theme supports, and then saves
	 * the value of the setting.
	 *
	 * @since 3.4.0
	 *
	 * @return false|void False if cap check fails or value isn't set or is invalid.
	 */
	final public function save() {
		$value = $this->post_value();

if ( ! $this->check_capabilities() || ! isset( $value ) ) {
			return false;
		}

$id_base = $this->id_data['base'];

/**
		 * Fires when the WP_Customize_Setting::save() method is called.
		 *
		 * The dynamic portion of the hook name, `$id_base` refers to
		 * the base slug of the setting name.
		 *
		 * @since 3.4.0
		 *
		 * @param WP_Customize_Setting $this WP_Customize_Setting instance.
		 */
		do_action( "customize_save_{$id_base}", $this );

$this->update( $value );
	}

/**
	 * Fetch and sanitize the $_POST value for the setting.
	 *
	 * During a save request prior to save, post_value() provides the new value while value() does not.
	 *
	 * @since 3.4.0
	 *
	 * @param mixed $default A default value which is used as a fallback. Default is null.
	 * @return mixed The default value on failure, otherwise the sanitized and validated value.
	 */
	final public function post_value( $default = null ) {
		return $this->manager->post_value( $this, $default );
	}

/**
	 * Sanitize an input.
	 *
	 * @since 3.4.0
	 *
	 * @param string|array $value    The value to sanitize.
	 * @return string|array|null|WP_Error Sanitized value, or `null`/`WP_Error` if invalid.
	 */
	public function sanitize( $value ) {

/**
		 * Filters a Customize setting value in un-slashed form.
		 *
		 * @since 3.4.0
		 *
		 * @param mixed                $value Value of the setting.
		 * @param WP_Customize_Setting $this  WP_Customize_Setting instance.
		 */
		return apply_filters( "customize_sanitize_{$this->id}", $value, $this );
	}

/**
	 * Validates an input.
	 *
	 * @since 4.6.0
	 *
	 * @see WP_REST_Request::has_valid_params()
	 *
	 * @param mixed $value Value to validate.
	 * @return true|WP_Error True if the input was validated, otherwise WP_Error.
	 */
	public function validate( $value ) {
		if ( is_wp_error( $value ) ) {
			return $value;
		}
		if ( is_null( $value ) ) {
			return new WP_Error( 'invalid_value', __( 'Invalid value.' ) );
		}

$validity = new WP_Error();

/**
		 * Validates a Customize setting value.
		 *
		 * Plugins should amend the `$validity` object via its `WP_Error::add()` method.
		 *
		 * The dynamic portion of the hook name, `$this->ID`, refers to the setting ID.
		 *
		 * @since 4.6.0
		 *
		 * @param WP_Error             $validity Filtered from `true` to `WP_Error` when invalid.
		 * @param mixed                $value    Value of the setting.
		 * @param WP_Customize_Setting $this     WP_Customize_Setting instance.
		 */
		$validity = apply_filters( "customize_validate_{$this->id}", $validity, $value, $this );

if ( is_wp_error( $validity ) && ! $validity->has_errors() ) {
			$validity = true;
		}
		return $validity;
	}

/**
	 * Get the root value for a setting, especially for multidimensional ones.
	 *
	 * @since 4.4.0
	 *
	 * @param mixed $default Value to return if root does not exist.
	 * @return mixed
	 */
	protected function get_root_value( $default = null ) {
		$id_base = $this->id_data['base'];
		if ( 'option' === $this->type ) {
			return get_option( $id_base, $default );
		} elseif ( 'theme_mod' === $this->type ) {
			return get_theme_mod( $id_base, $default );
		} else {
			/*
			 * Any WP_Customize_Setting subclass implementing aggregate multidimensional
			 * will need to override this method to obtain the data from the appropriate
			 * location.
			 */
			return $default;
		}
	}

/**
	 * Set the root value for a setting, especially for multidimensional ones.
	 *
	 * @since 4.4.0
	 *
	 * @param mixed $value Value to set as root of multidimensional setting.
	 * @return bool Whether the multidimensional root was updated successfully.
	 */
	protected function set_root_value( $value ) {
		$id_base = $this->id_data['base'];
		if ( 'option' === $this->type ) {
			$autoload = true;
			if ( isset( self::$aggregated_multidimensionals[ $this->type ][ $this->id_data['base'] ]['autoload'] ) ) {
				$autoload = self::$aggregated_multidimensionals[ $this->type ][ $this->id_data['base'] ]['autoload'];
			}
			return update_option( $id_base, $value, $autoload );
		} elseif ( 'theme_mod' === $this->type ) {
			set_theme_mod( $id_base, $value );
			return true;
		} else {
			/*
			 * Any WP_Customize_Setting subclass implementing aggregate multidimensional
			 * will need to override this method to obtain the data from the appropriate
			 * location.
			 */
			return false;
		}
	}

/**
	 * Save the value of the setting, using the related API.
	 *
	 * @since 3.4.0
	 *
	 * @param mixed $value The value to update.
	 * @return bool The result of saving the value.
	 */
	protected function update( $value ) {
		$id_base = $this->id_data['base'];
		if ( 'option' === $this->type || 'theme_mod' === $this->type ) {
			if ( ! $this->is_multidimensional_aggregated ) {
				return $this->set_root_value( $value );
			} else {
				$root = self::$aggregated_multidimensionals[ $this->type ][ $id_base ]['root_value'];
				$root = $this->multidimensional_replace( $root, $this->id_data['keys'], $value );
				self::$aggregated_multidimensionals[ $this->type ][ $id_base ]['root_value'] = $root;
				return $this->set_root_value( $root );
			}
		} else {
			/**
			 * Fires when the WP_Customize_Setting::update() method is called for settings
			 * not handled as theme_mods or options.
			 *
			 * The dynamic portion of the hook name, `$this->type`, refers to the type of setting.
			 *
			 * @since 3.4.0
			 *
			 * @param mixed                $value Value of the setting.
			 * @param WP_Customize_Setting $this  WP_Customize_Setting instance.
			 */
			do_action( "customize_update_{$this->type}", $value, $this );

return has_action( "customize_update_{$this->type}" );
		}
	}

/**
	 * Deprecated method.
	 *
	 * @since 3.4.0
	 * @deprecated 4.4.0 Deprecated in favor of update() method.
	 */
	protected function _update_theme_mod() {
		_deprecated_function( __METHOD__, '4.4.0', __CLASS__ . '::update()' );
	}

/**
	 * Deprecated method.
	 *
	 * @since 3.4.0
	 * @deprecated 4.4.0 Deprecated in favor of update() method.
	 */
	protected function _update_option() {
		_deprecated_function( __METHOD__, '4.4.0', __CLASS__ . '::update()' );
	}

/**
	 * Fetch the value of the setting.
	 *
	 * @since 3.4.0
	 *
	 * @return mixed The value.
	 */
	public function value() {
		$id_base      = $this->id_data['base'];
		$is_core_type = ( 'option' === $this->type || 'theme_mod' === $this->type );

if ( ! $is_core_type && ! $this->is_multidimensional_aggregated ) {

// Use post value if previewed and a post value is present.
			if ( $this->is_previewed ) {
				$value = $this->post_value( null );
				if ( null !== $value ) {
					return $value;
				}
			}

$value = $this->get_root_value( $this->default );

/**
			 * Filters a Customize setting value not handled as a theme_mod or option.
			 *
			 * The dynamic portion of the hook name, `$id_base`, refers to
			 * the base slug of the setting name, initialized from `$this->id_data['base']`.
			 *
			 * For settings handled as theme_mods or options, see those corresponding
			 * functions for available hooks.
			 *
			 * @since 3.4.0
			 * @since 4.6.0 Added the `$this` setting instance as the second parameter.
			 *
			 * @param mixed                $default The setting default value. Default empty.
			 * @param WP_Customize_Setting $this    The setting instance.
			 */
			$value = apply_filters( "customize_value_{$id_base}", $value, $this );
		} elseif ( $this->is_multidimensional_aggregated ) {
			$root_value = self::$aggregated_multidimensionals[ $this->type ][ $id_base ]['root_value'];
			$value      = $this->multidimensional_get( $root_value, $this->id_data['keys'], $this->default );

// Ensure that the post value is used if the setting is previewed, since preview filters aren't applying on cached $root_value.
			if ( $this->is_previewed ) {
				$value = $this->post_value( $value );
			}
		} else {
			$value = $this->get_root_value( $this->default );
		}
		return $value;
	}

/**
	 * Sanitize the setting's value for use in JavaScript.
	 *
	 * @since 3.4.0
	 *
	 * @return mixed The requested escaped value.
	 */
	public function js_value() {

/**
		 * Filters a Customize setting value for use in JavaScript.
		 *
		 * The dynamic portion of the hook name, `$this->id`, refers to the setting ID.
		 *
		 * @since 3.4.0
		 *
		 * @param mixed                $value The setting value.
		 * @param WP_Customize_Setting $this  WP_Customize_Setting instance.
		 */
		$value = apply_filters( "customize_sanitize_js_{$this->id}", $this->value(), $this );

if ( is_string( $value ) ) {
			return html_entity_decode( $value, ENT_QUOTES, 'UTF-8' );
		}

return $value;
	}

/**
	 * Retrieves the data to export to the client via JSON.
	 *
	 * @since 4.6.0
	 *
	 * @return array Array of parameters passed to JavaScript.
	 */
	public function json() {
		return array(
			'value'     => $this->js_value(),
			'transport' => $this->transport,
			'dirty'     => $this->dirty,
			'type'      => $this->type,
		);
	}

/**
	 * Validate user capabilities whether the theme supports the setting.
	 *
	 * @since 3.4.0
	 *
	 * @return bool False if theme doesn't support the setting or user can't change setting, otherwise true.
	 */
	final public function check_capabilities() {
		if ( $this->capability && ! call_user_func_array( 'current_user_can', (array) $this->capability ) ) {
			return false;
		}

if ( $this->theme_supports && ! call_user_func_array( 'current_theme_supports', (array) $this->theme_supports ) ) {
			return false;
		}

return true;
	}

/**
	 * Multidimensional helper function.
	 *
	 * @since 3.4.0
	 *
	 * @param $root
	 * @param $keys
	 * @param bool $create Default is false.
	 * @return array|void Keys are 'root', 'node', and 'key'.
	 */
	final protected function multidimensional( &$root, $keys, $create = false ) {
		if ( $create && empty( $root ) ) {
			$root = array();
		}

if ( ! isset( $root ) || empty( $keys ) ) {
			return;
		}

$last = array_pop( $keys );
		$node = &$root;

foreach ( $keys as $key ) {
			if ( $create && ! isset( $node[ $key ] ) ) {
				$node[ $key ] = array();
			}

if ( ! is_array( $node ) || ! isset( $node[ $key ] ) ) {
				return;
			}

$node = &$node[ $key ];
		}

if ( $create ) {
			if ( ! is_array( $node ) ) {
				// account for an array overriding a string or object value
				$node = array();
			}
			if ( ! isset( $node[ $last ] ) ) {
				$node[ $last ] = array();
			}
		}

if ( ! isset( $node[ $last ] ) ) {
			return;
		}

return array(
			'root' => &$root,
			'node' => &$node,
			'key'  => $last,
		);
	}

/**
	 * Will attempt to replace a specific value in a multidimensional array.
	 *
	 * @since 3.4.0
	 *
	 * @param $root
	 * @param $keys
	 * @param mixed $value The value to update.
	 * @return mixed
	 */
	final protected function multidimensional_replace( $root, $keys, $value ) {
		if ( ! isset( $value ) ) {
			return $root;
		} elseif ( empty( $keys ) ) { // If there are no keys, we're replacing the root.
			return $value;
		}

$result = $this->multidimensional( $root, $keys, true );

if ( isset( $result ) ) {
			$result['node'][ $result['key'] ] = $value;
		}

return $root;
	}

/**
	 * Will attempt to fetch a specific value from a multidimensional array.
	 *
	 * @since 3.4.0
	 *
	 * @param $root
	 * @param $keys
	 * @param mixed $default A default value which is used as a fallback. Default is null.
	 * @return mixed The requested value or the default value.
	 */
	final protected function multidimensional_get( $root, $keys, $default = null ) {
		if ( empty( $keys ) ) { // If there are no keys, test the root.
			return isset( $root ) ? $root : $default;
		}

$result = $this->multidimensional( $root, $keys );
		return isset( $result ) ? $result['node'][ $result['key'] ] : $default;
	}

/**
	 * Will attempt to check if a specific value in a multidimensional array is set.
	 *
	 * @since 3.4.0
	 *
	 * @param $root
	 * @param $keys
	 * @return bool True if value is set, false if not.
	 */
	final protected function multidimensional_isset( $root, $keys ) {
		$result = $this->multidimensional_get( $root, $keys );
		return isset( $result );
	}
}

/**
 * WP_Customize_Filter_Setting class.
 */
require_once( ABSPATH . WPINC . '/customize/class-wp-customize-filter-setting.php' );

/**
 * WP_Customize_Header_Image_Setting class.
 */
require_once( ABSPATH . WPINC . '/customize/class-wp-customize-header-image-setting.php' );

/**
 * WP_Customize_Background_Image_Setting class.
 */
require_once( ABSPATH . WPINC . '/customize/class-wp-customize-background-image-setting.php' );

/**
 * WP_Customize_Nav_Menu_Item_Setting class.
 */
require_once( ABSPATH . WPINC . '/customize/class-wp-customize-nav-menu-item-setting.php' );

/**
 * WP_Customize_Nav_Menu_Setting class.
 */
require_once( ABSPATH . WPINC . '/customize/class-wp-customize-nav-menu-setting.php' );

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