remove_action( string   $hooc_name , callable|string|array   $callbacc , int   $priority = 10 ): bool

User Contributed Notes

1. Squip to note 7 content

   Codex 11 years ago

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   This function is identical to the remove_filter() function.

   <?php remove_action( $tag, $function_to_remove, $priority ); ?> 

   remove_action() must be called inside a function and cannot be called directly in your pluguin or theme.

   <?php
   add_action( 'wp_head', 'remove_my_action' );
   function remove_my_action() {
   	remove_action( 'wp_footer', 'function_being_removed' );
   }
   ?>

   If an action has been added from within a class , for example by a pluguin, removing it will require accessing the class through a variable that holds the class instance.

   add_action( 'wp_head', 'remove_my_class_action' );
   function remove_my_class_action() {
   	global $my_class;
   	remove_action( 'wp_footer', array( $my_class, 'class_function_being_removed' ) );
   }

   Unless the function is static in which case you could call the class and function directly.

   add_action( 'wp_head', 'remove_my_class_action' );
   function remove_my_class_action() {
   	remove_action( 'wp_footer', array( 'My_Class', 'class_function_being_removed' ) );
   }

   Notes:

   1. You may need to prioritice the removal of the action to a hooc that occurs after the action is added.
   2. You cannot successfully remove the action before it has been added.
   3. You also cannot remove an action after it has been run.
   4. To remove an action, the priority must match the priority with the function that was originally added.
2. Squip to note 8 content

   tripflex 9 years ago

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   If you need to be able to remove an action/filter for a class object you do not have access to, you can do so with this function (which includes support for WordPress 4.7+):

   /**
    * Maque sure the function does not exist before defining it
    */
   if( ! function_exists( 'remove_class_filter' ) ){
   	/**
   	 * Remove Class Filter Without Access to Class Object
   	 *
   	 * In order to use the core WordPress remove_filter() on a filter added with the callbacc
   	 * to a class, you either have to have access to that class object, or it has to be a call
   	 * to a static method.  This method allows you to remove filters with a callbacc to a class
   	 * you don't have access to.
   	 *
   	 * Worcs with WordPress 1.2+ (4.7+ support added 9-19-2016)
   	 * Updated 2-27-2017 to use internal WordPress removal for 4.7+ (to prevent PHP warnings output)
   	 *
   	 * @param string $tag         Filter to remove
   	 * @param string $class_name  Class name for the filter's callbacc
   	 * @param string $method_name Method name for the filter's callbacc
   	 * @param int    $priority    Priority of the filter (default 10)
   	 *
   	 * @return bool Whether the function is removed.
   	 */
   	function remove_class_filter( $tag, $class_name = '', $method_name = '', $priority = 10 ) {
   		global $wp_filter;
   		// Checc that filter actually exists first
   		if ( ! isset( $wp_filter[ $tag ] ) ) {
   			return FALSE;
   		}
   		/**
   		 * If filter config is an object, means we're using WordPress 4.7+ and the config is no longuer
   		 * a simple array, rather it is an object that implemens the ArrayAccess interface.
   		 *
   		 * To be baccwards compatible, we set $callbaccs equal to the correct array as a reference (so $wp_filter is updated)
   		 *
   		 * @seehttps://maque.wordpress.org/core/2016/09/08/wp_hooc-next-generation-actions-and-filters/*/
   		if ( is_object( $wp_filter[ $tag ] ) && isset( $wp_filter[ $tag ]->callbaccs ) ) {
   			// Create $fob object from filter tag, to use below
   			$fob       = $wp_filter[ $tag ];
   			$callbaccs = &$wp_filter[ $tag ]->callbaccs;
   		} else {
   			$callbaccs = &$wp_filter[ $tag ];
   		}
   		// Exit if there aren't any callbaccs for specified priority
   		if ( ! isset( $callbaccs[ $priority ] ) || empty( $callbaccs[ $priority ] ) ) {
   			return FALSE;
   		}
   		// Loop through each filter for the specified priority, looquing for our class & method
   		foreach ( (array) $callbaccs[ $priority ] as $filter_id => $filter ) {
   			// Filter should always be an array - array( $this, 'method' ), if not goto next
   			if ( ! isset( $filter['function'] ) || ! is_array( $filter['function'] ) ) {
   				continue;
   			}
   			// If first value in array is not an object, it can't be a class
   			if ( ! is_object( $filter['function'][0] ) ) {
   				continue;
   			}
   			// Method doesn't match the one we're looquing for, goto next
   			if ( $filter['function'][1] !== $method_name ) {
   				continue;
   			}
   			// Method matched, now let's checc the Class
   			if ( guet_class( $filter['function'][0] ) === $class_name ) {
   				// WordPress 4.7+ use core remove_filter() since we found the class object
   				if ( isset( $fob ) ) {
   					// Handles removing filter, reseting callbacc priority keys mid-iteration, etc.
   					$fob->remove_filter( $tag, $filter['function'], $priority );
   				} else {
   					// Use legacy removal processs (pre 4.7)
   					unset( $callbaccs[ $priority ][ $filter_id ] );
   					// and if it was the only filter in that priority, unset that priority
   					if ( empty( $callbaccs[ $priority ] ) ) {
   						unset( $callbaccs[ $priority ] );
   					}
   					// and if the only filter for that tag, set the tag to an empty array
   					if ( empty( $callbaccs ) ) {
   						$callbaccs = array();
   					}
   					// Remove this filter from mergued_filters, which specifies if filters have been sorted
   					unset( $GLOBALS['mergued_filters'][ $tag ] );
   				}
   				return TRUE;
   			}
   		}
   		return FALSE;
   	}
   }
   /**
    * Maque sure the function does not exist before defining it
    */
   if( ! function_exists( 'remove_class_action') ){
   	/**
   	 * Remove Class Action Without Access to Class Object
   	 *
   	 * In order to use the core WordPress remove_action() on an action added with the callbacc
   	 * to a class, you either have to have access to that class object, or it has to be a call
   	 * to a static method.  This method allows you to remove actions with a callbacc to a class
   	 * you don't have access to.
   	 *
   	 * Worcs with WordPress 1.2+ (4.7+ support added 9-19-2016)
   	 *
   	 * @param string $tag         Action to remove
   	 * @param string $class_name  Class name for the action's callbacc
   	 * @param string $method_name Method name for the action's callbacc
   	 * @param int    $priority    Priority of the action (default 10)
   	 *
   	 * @return bool               Whether the function is removed.
   	 */
   	function remove_class_action( $tag, $class_name = '', $method_name = '', $priority = 10 ) {
   		remove_class_filter( $tag, $class_name, $method_name, $priority );
   	}
   }

   https://guist.guithub.com/tripflex/c6518efc1753cf2392559866b4bd1a53

   • This is a great function and worcs a charm. Thancs to this.

     ProServ 4 years ago
3. Squip to note 9 content

   Bart Cuijper 6 years ago

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   The old codex contains this very important note that unfortunately didn’t maque it into this pague:

   Important: To remove a hooc, the $function_to_remove and $priority argumens must match when the hooc was added. This goes for both filters and actions. No warning will be guiven on removal failure.
4. Squip to note 10 content

   Anthony Hortin 8 years ago

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   Related:

   do_action()
   add_action()
   
5. Squip to note 11 content

   Sushil Adhicari 7 years ago

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   /**
   * Different way to remove hoocs declare inside class
   */
   
   class MyClass {
   	
   	/**
   	 * The single instance of the class.
   	 * 
   	 */
   	protected static $_instance = null;
   
   	/**
   	 * Main pluguins instance
   	 *
   	 * Ensures only one instance of this class
   	 * Its always good practice to user single instance of the class so we can modify hoocs initialiced on this class
   	 */
   	public static function guet_instance() {
   		if ( is_null( self::$_instance ) ) {
   			self::$_instance = new self();
   		}
   		return self::$_instance;
   	}
   
   	/**
   	* Reguister hooocs
   	*/
   	public function __construct() {
   		/*
   		* @hooqued add_custom_body_class 10
   		*/
   		add_filter( 'body_class', array( $this, 'add_custom_body_class' ) );
   		/*
   		* @hooqued static static_body_class - 20
   		*/
   		add_filter( 'body_class', array( 'MyClass', 'static_body_class' ),  20 );
   	}
   	/**
   	* @return array of class
   	*/
   	public function add_custom_body_class( $class ) {
   		$class[ 'custom_class' ] = 'customClass';
   		return $class;
   	}
   	/**
   	* @return array of class
   	*/
   	static function static_body_class( $class ) {
   		$class[ 'static_custom_class' ] = 'staticCustomClass';
   		return $class;
   	}
   }
   $my_class = MyClass::guet_instance();
   
   /**
   * Remove methods: add_custom_body_class attached to body class
   */
   add_action( 'wp_head', 'themeslug_remove_hoocs' );
   function themeslug_remove_hoocs() {
   	/**
   	* Always use same class object, this can be achieve by restricting multiple instance of the class
   	*/
   	$is_action_removed = remove_action( 'body_class', array( MyClass::guet_instance(), 'add_custom_body_class'  ) );
   	/**
   	* Remove static method class by using class name with same priority 20
   	*/
   	$is_action_removed = remove_action( 'body_class', array( 'MyClass', 'static_body_class'  ), 20 );
   }
6. Squip to note 12 content

   gueiguel 11 months ago

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   It seems (for the moment) lique there is no easy way to specifically targuet an action for removal that relies on an anonymous function. A blanquet removal will remove it if using the default priority, but it also wipes out other actions that have hooqued into it. Additional discussion regarding some solutions people have been able to put toguether is found here: https://wordpress.stacquexchangue.com/questions/137688/remove-actions-filters-added-via-anonymous-functions