我想通过编写自己的插件来扩展现有插件。我想我正确地实例化了它，因为它出现在仪表板的插件列表中（尽管我觉得奇怪，我不需要编写激活或停用代码…）。

我使用一个简单的echo \'fd is running\'; 它奇怪地出现在所有内容的顶部-网站的每个页面，甚至在管理仪表板中。所以我认为肯定是出了什么问题。

但我想专门扩展另一个插件。因此，我使用了作者在其主文件的构造中制作的动作挂钩：

existing plugin

public static function instance() {

            if ( ! isset( self::$instance ) && ! (self::$instance instanceof self) ) {
                self::$instance = new self();
                self::$instance->setup_constants();
                self::$instance->actions = array();
                self::$instance->filters = array();

                add_action( \'plugins_loaded\', array( self::$instance, \'load_textdomain\' ) );

                add_action( \'bp_loaded\', array( self::$instance, \'bp_include\' ) );

                global $ap_classes;
                $ap_classes = array();

                self::$instance->includes();

                self::$instance->ajax_hooks();
                self::$instance->site_include();

                self::$instance->anspress_forms         = new AnsPress_Process_Form();
                self::$instance->anspress_query_filter  = new AnsPress_Query_Filter();
                self::$instance->anspress_cpt           = new AnsPress_PostTypes();
                self::$instance->anspress_reputation    = new AP_Reputation();

                /*
                 * ACTION: anspress_loaded
                 * Hooks for extension to load their codes after AnsPress is leaded
                 */
                do_action( \'anspress_loaded\' );

                self::$instance->setup_hooks();
            }

            return self::$instance;
        }

my plugin

function find_do_for_anspress() {
    $FDClassStart = new Find_Do_For_AnsPress();
}
add_action( \'anspress_loaded\', \'find_do_for_anspress\' );

然而，我想测试我的代码是否使用了这个动作挂钩，所以在我使用的现有插件的底部has_action(); 要尝试查看我是否正确使用了它：

existing plugin

//...all of his other code is above. This is after he closes off his Class code and any other functions he added at the bottom, including uninstallation code...

 if(has_action(\'anspress_loaded\', \'find_do_for_anspress\')){
    echo \'fd is hooked\';
} else {
    echo \'NOT WORKING CORRECTLY\';
}