php call_user_func函數

1. 函數說明

　　呼叫回調函數。原型： mixed call_user_func ( callable cal ,mix edparameter [, mixed $… ]] )。 第一個參數 callback 是被呼叫的回呼函數，其餘參數是回呼函數的參數。參數可以有多個，也可以是陣列。 　　參數不可以為引用，但可以透過數組傳遞引用。以下為範例：

<code><span><?php </span><span><span>function</span><span>addone</span><span>(&<span>$num</span>)</span> {</span><span>$num</span> ++; 
}

<span>$num</span> = <span>0</span>;

call_user_func(<span>'addone'</span>, <span>$num</span>);
<span>echo</span><span>"num : "</span> . <span>$num</span> . <span>"\n"</span>;

call_user_func_array(<span>'addone'</span>, <span>array</span>(&<span>$num</span>) );
<span>echo</span><span>"num : "</span> . <span>$num</span> . <span>"\n"</span>;

<span>?></span></span></code>

　　輸出： 　　０ 　　１ 　　傳回值：傳回回呼函數的回傳值，如果錯誤則傳回FALSE。 2. 例

命名空間的使用。

<code><span><?php </span><span>namespace</span><span>Foobar</span>;

<span><span>class</span><span>Foo</span> {</span><span>static</span><span>public</span><span><span>function</span><span>test</span><span>()</span> {</span><span>print</span><span>"Hello world!\n"</span>;
    }
}

call_user_func(<span>__NAMESPACE__</span> .<span>'\Foo::test'</span>); 
call_user_func(<span>array</span>(<span>__NAMESPACE__</span> .<span>'\Foo'</span>, <span>'test'</span>)); 

<span>?></span></span></code>

呼叫一個類別裡面的方法

<code><span><?php </span><span><span>class</span><span>myclass</span> {</span><span>static</span><span><span>function</span><span>test</span><span>()</span>
    {</span><span>echo</span><span>"Hello world!\n"</span>;
    }
}

<span>$classname</span> = <span>"myclass"</span>;

call_user_func(<span>array</span>(<span>$classname</span>, <span>'test'</span>));

<span>$myobject</span> = <span>new</span> myclass();

call_user_func(<span>array</span>(<span>$myobject</span>, <span>'test'</span>));

<span>?></span></span></code>

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