gistfile1.txt

function wpex_remove_class_filter( $hook_name = '', $class_name ='', $method_name = '', $priority = 0 ) {
	global $wp_filter;

	// Make sure class exists
	if ( ! class_exists( $class_name ) ) {
		return false;
	}

	// Take only filters on right hook name and priority
	if ( ! isset($wp_filter[$hook_name][$priority] ) || ! is_array( $wp_filter[$hook_name][$priority] ) ) {
		return false;
	}

	// Loop on filters registered
	foreach( (array) $wp_filter[$hook_name][$priority] as $unique_id => $filter_array ) {

		// Test if filter is an array ! (always for class/method)
		// @todo consider using has_action instead
		// @link https://make.wordpress.org/core/2016/09/08/wp_hook-next-generation-actions-and-filters/
		if ( isset( $filter_array['function'] ) && is_array( $filter_array['function'] ) ) {

			// Test if object is a class, class and method is equal to param !
			if ( is_object( $filter_array['function'][0] )
				&& get_class( $filter_array['function'][0] )
				&& get_class( $filter_array['function'][0] ) == $class_name
				&& $filter_array['function'][1] == $method_name
			) {
				if ( isset( $wp_filter[$hook_name] ) ) {
					// WP 4.7
					if ( is_object( $wp_filter[$hook_name] ) ) {
						unset( $wp_filter[$hook_name]->callbacks[$priority][$unique_id] );
					}
					// WP 4.6
					else {
						unset( $wp_filter[$hook_name][$priority][$unique_id] );
					}
				}
			}

		}

	}
	return false;
}