function acfe_remove_filter()

in web/wp-content/plugins/acf-extended/includes/acfe-wp-functions.php [84:206]

• 61 lines of code
• 22 McCabe index (conditional complexity)

function acfe_remove_filter($tag = '', $function = '', $priority = 10){
    
    // string
    if(is_string($function)){
        return remove_filter($tag, $function, $priority);
    }
    
    // validate array($class, 'method')
    if(!is_array($function) || !isset($function[0]) || !isset($function[1])){
        return false;
    }
    
    // already class instance
    if(is_object($function[0])){
        return remove_filter($tag, $function, $priority);
    }
    
    // vars
    $class = $function[0];
    $method = $function[1];
    
    // check acf instance
    global $acf_instances;
    
    if(isset($acf_instances[ $class ])){
        return remove_filter($tag, array($acf_instances[ $class ], $method), $priority);
    }
    
    // check acf field types
    $field_type = acf_get_field_type($class);
    
    if($field_type){
        return remove_filter($tag, array($field_type, $method), $priority);
    }
    
    // remove filter
    // based on: https://gist.github.com/tripflex/c6518efc1753cf2392559866b4bd1a53
    global $wp_filter;

    // Check 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 longer
     * a simple array, rather it is an object that implements the ArrayAccess interface.
     *
     * To be backwards compatible, we set $callbacks equal to the correct array as a reference (so $wp_filter is updated)
     *
     * @see https://make.wordpress.org/core/2016/09/08/wp_hook-next-generation-actions-and-filters/
     */
    if(is_object($wp_filter[ $tag ]) && isset($wp_filter[ $tag ]->callbacks)){
        
        // Create $fob object from filter tag, to use below
        $fob       = $wp_filter[ $tag ];
        $callbacks = &$wp_filter[ $tag ]->callbacks;
        
    }else{
        $callbacks = &$wp_filter[ $tag ];
    }

    // Exit if there aren't any callbacks for specified priority
    if(!isset($callbacks[ $priority ]) || empty($callbacks[ $priority ])){
        return false;
    }

    // Loop through each filter for the specified priority, looking for our class & method
    foreach((array) $callbacks[ $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 looking for, goto next
        if($filter['function'][1] !== $method){
            continue;
        }
    
        // Method matched, now let's check the Class
        if(get_class($filter['function'][0]) === $class){
        
            // WordPress 4.7+ use core remove_filter() since we found the class object
            if(isset($fob)){
                
                // Handles removing filter, reseting callback priority keys mid-iteration, etc.
                $fob->remove_filter($tag, $filter['function'], $priority);
            
            }else{
                
                // Use legacy removal process (pre 4.7)
                unset($callbacks[ $priority ][ $filter_id ]);
                
                // and if it was the only filter in that priority, unset that priority
                if(empty($callbacks[ $priority ])){
                    unset($callbacks[ $priority ]);
                }
                
                // and if the only filter for that tag, set the tag to an empty array
                if(empty($callbacks)){
                    $callbacks = array();
                }
                
                // Remove this filter from merged_filters, which specifies if filters have been sorted
                unset($GLOBALS['merged_filters'][ $tag ]);
                
            }
        
            return true;
            
        }
        
    }

    return false;
    
}