PHP Callback 回调类型 js callback call back to asynccallbac

<span>// Type 1: Simple callback</span>
call_user_func(<span>'my_callback_function'</span>); 

<span>// Type 2: Static class method call</span>
call_user_func(<span>array</span>(<span>'MyClass'</span>, <span>'myCallbackMethod'</span>)); 

<span>// Type 3: Object method call</span><span>$obj</span> = <span>new</span> MyClass();
call_user_func(<span>array</span>(<span>$obj</span>, <span>'myCallbackMethod'</span>));

<span>// Type 4: Static class method call (As of PHP 5.2.3)</span>
call_user_func(<span>'MyClass::myCallbackMethod'</span>);

<span>// Type 5: Relative static class method call (As of PHP 5.3.0)</span><span><span>class</span><span>A</span> {</span><span>public</span><span>static</span><span><span>function</span><span>who</span><span>()</span> {</span><span>echo</span><span>"A\n"</span>;
    }
}

<span><span>class</span><span>B</span><span>extends</span><span>A</span> {</span><span>public</span><span>static</span><span><span>function</span><span>who</span><span>()</span> {</span><span>echo</span><span>"B\n"</span>;
    }
}

call_user_func(<span>array</span>(<span>'B'</span>, <span>'parent::who'</span>)); <span>// A</span>