我正在编写一个Wordpress插件，用于为各个插件设置自动更新。我无法验证“auto\\u update\\u plugin”筛选器是否正常工作。我在回调函数中输入的任何内容都不会返回任何结果。就像从未调用过函数一样。

过滤器：

add_filter( \'auto_update_plugin\', array( $this, \'l7wau_auto_update_specific_plugins\' ), 10, 2 );

/**
     * Update specific plugins. Got this from Wordpress codex.
     */
    function l7wau_auto_update_specific_plugins( $update, $item ) {

        // Array for adding the path to file. Use for 3.8.1 and below.
        $new_plugin_array = array();
        $this->plugin_slug = \'changed\'; //Test to see if it is working. Nothing here.

        /**
         * Get the array of names/slugs to set to auto-update
         * Added the folder/file.php because the actual slug is not 
         * the file name.  It is the plugin folder and file with header use for 3.8.1 and below.
         */
        $plugins = $this->l7wau_get_array_plugins_to_update();

        if ( in_array( $item->slug, $plugins ) ) {
            return true; // Always update plugins in this array
        } else {
            return $update; // Else, use the normal API response to decide whether to update or not
        }
    }