在WordPress中，大多数函数直到事件堆栈中的某些点才会加载。在WordPress的事件驱动架构（EDA）中，您必须将类放入操作或过滤器中。

class MyGreatClass{

    public function __construct(){
        //I can use WP functions here
    }

    public function myGreatMethod(){
        return "I don\'t do much, but the WP functions are available to me!";
    }
}

//This line instantiates MyGreatClass and calls myGreatMethod during the "init" event.
add_action(\'init\', array(new MyGreatClass, myGreatFunction\'));