PHP Callback 回调类型 js callback call back to asynccallbac

看 composer 的 autoload 的时候发现他用 spl_autoload_register 注册了一个类 class 进去。。

明明记得是要传进去一个待注册的 autoload function 队列，查了查文档才发现关于 Callback 回调类型理解有误

看文档里面关于 Callback 回调类型的示例：

<code><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></code>

这里有5种回调类型，不仅仅是 function

学习，共勉。。

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以上就介绍了PHP Callback 回调类型，包括了call,back方面的内容，希望对PHP教程有兴趣的朋友有所帮助。