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<?php /** * Widget API: WP_Widget_Factory class * * @package WordPress * @subpackage Widgets * @since 4.4.0 */ /** * Singleton that registers and instantiates WP_Widget classes. * * @since 2.8.0 * @since 4.4.0 Moved to its own file from site-inc/widgets.php */ class WP_Widget_Factory { /** * Widgets array. * * @since 2.8.0 * @var array */ public $widgets = array(); /** * PHP5 constructor. * * @since 4.3.0 */ public function __construct() { add_action( 'widgets_init', array( $this, '_register_widgets' ), 100 ); } /** * PHP4 constructor. * * @since 2.8.0 */ public function WP_Widget_Factory() { _deprecated_constructor( 'WP_Widget_Factory', '4.2.0' ); self::__construct(); } /** * Memory for the number of times unique class instances have been hashed. * * This can be eliminated in favor of straight spl_object_hash() when 5.3 * is the minimum requirement for PHP. * * @since 4.6.0 * @var array * * @see WP_Widget_Factory::hash_object() */ private $hashed_class_counts = array(); /** * Hashes an object, doing fallback of `spl_object_hash()` if not available. * * This can be eliminated in favor of straight spl_object_hash() when 5.3 * is the minimum requirement for PHP. * * @since 4.6.0 * * @param WP_Widget $widget Widget. * @return string Object hash. */ private function hash_object( $widget ) { if ( function_exists( 'spl_object_hash' ) ) { return spl_object_hash( $widget ); } else { $class_name = get_class( $widget ); $hash = $class_name; if ( ! isset( $widget->_wp_widget_factory_hash_id ) ) { if ( ! isset( $this->hashed_class_counts[ $class_name ] ) ) { $this->hashed_class_counts[ $class_name ] = 0; } $this->hashed_class_counts[ $class_name ] += 1; $widget->_wp_widget_factory_hash_id = $this->hashed_class_counts[ $class_name ]; } $hash .= ':' . $widget->_wp_widget_factory_hash_id; return $hash; } } /** * Registers a widget subclass. * * @since 2.8.0 * @since 4.6.0 Updated the `$widget` parameter to also accept a WP_Widget instance object * instead of simply a `WP_Widget` subclass name. * * @param string|WP_Widget $widget Either the name of a `WP_Widget` subclass or an instance of a `WP_Widget` subclass. */ public function register( $widget ) { if ( $widget instanceof WP_Widget ) { $this->widgets[ $this->hash_object( $widget ) ] = $widget; } else { $this->widgets[ $widget ] = new $widget(); } } /** * Un-registers a widget subclass. * * @since 2.8.0 * @since 4.6.0 Updated the `$widget` parameter to also accept a WP_Widget instance object * instead of simply a `WP_Widget` subclass name. * * @param string|WP_Widget $widget Either the name of a `WP_Widget` subclass or an instance of a `WP_Widget` subclass. */ public function unregister( $widget ) { if ( $widget instanceof WP_Widget ) { unset( $this->widgets[ $this->hash_object( $widget ) ] ); } else { unset( $this->widgets[ $widget ] ); } } /** * Serves as a utility method for adding widgets to the registered widgets global. * * @since 2.8.0 * * @global array $wp_registered_widgets */ public function _register_widgets() { global $wp_registered_widgets; $keys = array_keys( $this->widgets ); $registered = array_keys( $wp_registered_widgets ); $registered = array_map( '_get_widget_id_base', $registered ); foreach ( $keys as $key ) { // don't register new widget if old widget with the same id is already registered if ( in_array( $this->widgets[ $key ]->id_base, $registered, true ) ) { unset( $this->widgets[ $key ] ); continue; } $this->widgets[ $key ]->_register(); } } }
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