Fonctionnalities for WP >= 4.7 to remove filter/action defined by a callback function, a static or dynamic method from a class,

remove_filter.php

<?php
/**
 * Function remove_filter_x(): Remove filter/action defined by a callback function, a static or dynamic method from a class
 * WP version >= 4.7 
 * @author  Xavier Birnie-Scott <xavierbirniescott@yahoo.fr>
 * @version  1.0 [2020-12-18] Short version
 * @see https://make.wordpress.org/core/2016/09/08/wp_hook-next-generation-actions-and-filters/
 * @see https://murviel-info-beziers.com/supprimer-filtre-action-methode-classe-wordpress/
 * @param  array $args: [
 *    'hook' hook name, mandatory
 *    'class' class name
 *    'method' method name
 *    'function' function name
 *    'priority' 10 by default if omitted
 * ]
 * ($class and $method) or $function is mandatory
 * @return bool true if success, false otherwise
 */
function remove_filter_x( $args ) {
   $default = [
      'hook' => false,
      'class' => false,
      'method' => false,
      'function' => false,
      'priority' => 10,
   ];
   extract( wp_parse_args( $args, $default ) );

   global $wp_filter;
   
   // Checks if hook is not missing
   if( ! $hook ) return false;

   // Checks if it's a valid hook
   if( empty( $wp_filter[$hook] ) ) return false;

   // Checks if hook exists with that priority
   if( empty( $wp_filter[$hook]->callbacks[$priority] ) ) return false;

   $unset = false;

   foreach( $wp_filter[$hook]->callbacks[$priority] as $key => $arr ) {
      // Function
      if( is_string( $arr['function'] ) ) {
         if( $function == $arr['function'] ) {
            $result['function'] = $arr['function'];
            unset( $wp_filter[$hook]->callbacks[$priority][$key] );
            $unset = true;
            break;
         }
      }
      // Static method
      else if( is_array( $arr['function'][0] ) ) {
         if( $arr['function'][0] == $class && $arr['function'][1] == $method ) {
            unset( $wp_filter[$hook]->callbacks[$priority][$key] );
            $unset = true;
            break;
         }
      }
      // Dynamic method
      else if( is_object( $arr['function'][0] ) ) {
         if( get_class( $arr['function'][0] ) == $class && $arr['function'][1] == $method ) {
            unset( $wp_filter[$hook]->callbacks[$priority][$key] );
            $unset = true;
            break;
         }
      }
   }

   return $unset;
}

/**
 * Function remove_filter_ctrl(): Remove filter/action defined by a callback function, a static or dynamic method from a class, with error control.
 * WP version >= 4.7 
 * @author  Xavier Birnie-Scott <xavierbirniescott@yahoo.fr>
 * @version  1.0 [2020-12-18] with error control
 * @see https://make.wordpress.org/core/2016/09/08/wp_hook-next-generation-actions-and-filters/
 * @param  array $args: [
 *    'hook' hook name, mandatory
 *    'class' class name
 *    'method' method name
 *    'function' function name
 *    'priority' 10 by default if omitted
 *    'textdomain' text domain wp default if omitted
 * ]
 * ($class and $method) or $function is mandatory
 * @return WP_Error (invalid or bug with message) 
 *         or array ['hook', 
 *                   'priority', 
 *                   'key', (callback_id) 
 *                   'type', (function, static or dynamic)
 *                   'function' or 'class' and 'method']
 */
function remove_filter_ctrl( $args ) {
   $default = [
      'hook' => false,
      'class' => false,
      'method' => false,
      'function' => false,
      'priority' => 10,
      'textdomain' => 'default',
   ];
   extract( wp_parse_args( $args, $default ) );

   global $wp_filter;

   $error = new WP_Error;
   
   // Checks if hook is not missing
   if( ! $hook ) {
      return $error->add( 'invalid', __( 'hook property is mandatory', $textdomain ) );
   }

   // Checks if it's a valid hook
   if( empty( $wp_filter[$hook] ) ) {
      return $error->add( 'invalid', sprintf( __( '%s hook seems invalid', $textdomain ), $hook ) );
   }

   // Checks if hook exists with that priority
   if( empty( $wp_filter[$hook]->callbacks[$priority] ) ) {
      return $error->add( 'priority', sprintf( __( 'There is no %s hook with priority %d', $textdomain ), $hook, $priority ) );
   }

   $type = $unset = false;

   foreach( $wp_filter[$hook]->callbacks[$priority] as $key => $arr ) {
      $result['hook'] = $hook;
      $result['priority'] = $priority;
      $result['key'] = $key;
      // Function
      if( is_string( $arr['function'] ) ) {
         $result['type'] = 'function';
         $type = 'function';
         if( $function == $arr['function'] ) {
            $result['function'] = $arr['function'];
            unset( $wp_filter[$hook]->callbacks[$priority][$key] );
            $unset = true;
            break;
         }
      }
      // Static method
      else if( is_array( $arr['function'][0] ) ) {
         $result['type'] = 'static';
         $type = 'static';
         if( $arr['function'][0] == $class && $arr['function'][1] == $method ) {
            $result['class'] = $class;
            $result['method'] = $method;
            unset( $wp_filter[$hook]->callbacks[$priority][$key] );
            $unset = true;
            break;
         }
      }
      // Dynamic method
      else if( is_object( $arr['function'][0] ) ) {
         $result['type'] = 'dynamic';
         $type = 'dynamic';
         if( get_class( $arr['function'][0] ) == $class && $arr['function'][1] == $method ) {
            $result['class'] = $class;
            $result['method'] = $method;
            unset( $wp_filter[$hook]->callbacks[$priority][$key] );
            $unset = true;
            break;
         }
      }
   }

   if( ! $unset ) {
      if( $type == 'function' ) {
         return $error->add( 'invalid', sprintf( __( 'The %s function with the priority %d on the %s hook was not found', $textdomain ), $function, $priority, $hook ) );
      }
      else if( $type == 'static' ) {
         return $error->add( 'invalid', sprintf( __( 'The %s class and the %s static method with the priority %d on the %s hook was not found', $textdomain ), $class, $method, $priority, $hook ) );
      }
      else if( $type == 'dynamic' ) {
         return $error->add( 'invalid', sprintf( __( 'The %s class and the %s dynamic method with the priority %d on the %s hook was not found', $textdomain ), $class, $method, $priority, $hook ) );
      }
      else {
         return $error->add( 'bug', sprintf( __( 'The function is not able to remove the %s hook with priority %d for some unknown reason', $textdomain ), $hook, $priority ) );
      }
   }

   return $result;
}