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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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<html>
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<meta http-equiv="content-type" content="text/html; charset=UTF-8">
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<title>把第一个参数作为回调函数调用</title>
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</head>
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<body class="docs"><div id="layout">
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<div id="layout-content"><div id="function.call-user-func" class="refentry">
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<div class="refnamediv">
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<h1 class="refname">call_user_func</h1>
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<p class="verinfo">(PHP 4, PHP 5, PHP 7)</p><p class="refpurpose"><span class="refname">call_user_func</span> — <span class="dc-title">把第一个参数作为回调函数调用</span></p>
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</div>
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<div class="refsect1 description" id="refsect1-function.call-user-func-description">
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<h3 class="title">说明</h3>
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<div class="methodsynopsis dc-description">
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<span class="methodname"><strong>call_user_func</strong></span>
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( <span class="methodparam"><span class="type"><a href="language.types.callable.html" class="type callable">callable</a></span> <code class="parameter">$callback</code></span>
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[, <span class="methodparam"><span class="type"><a href="language.pseudo-types.html#language.types.mixed" class="type mixed">mixed</a></span> <code class="parameter">$parameter</code></span>
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[, <span class="methodparam"><span class="type"><a href="language.pseudo-types.html#language.types.mixed" class="type mixed">mixed</a></span> <code class="parameter">$...</code></span>
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]] ) : <span class="type"><a href="language.pseudo-types.html#language.types.mixed" class="type mixed">mixed</a></span></div>
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<p class="para rdfs-comment">
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第一个参数 <code class="parameter">callback</code> 是被调用的回调函数，其余参数是回调函数的参数。
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</p>
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</div>
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<div class="refsect1 parameters" id="refsect1-function.call-user-func-parameters">
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<h3 class="title">参数</h3>
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<p class="para">
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<dl>
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<dt>
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<code class="parameter">callback</code></dt>
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<dd>
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<p class="para">
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将被调用的回调函数（<span class="type"><a href="language.types.callable.html" class="type callable">callable</a></span>）。
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</p>
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</dd>
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<dt>
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<code class="parameter">parameter</code></dt>
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<dd>
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<p class="para">
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0个或以上的参数，被传入回调函数。
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</p>
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<blockquote class="note"><p><strong class="note">Note</strong>:
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<p class="para">
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请注意，传入<span class="function"><strong>call_user_func()</strong></span>的参数不能为引用传递。
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<div class="example" id="example-6188">
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<p><strong>Example #1 <span class="function"><strong>call_user_func()</strong></span> 的参考例子</strong></p>
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<div class="example-contents">
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<div class="phpcode"><pre><span style="color: #000000">
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<span style="color: #0000BB"><?php<br />error_reporting</span><span style="color: #007700">(</span><span style="color: #0000BB">E_ALL</span><span style="color: #007700">);<br />function </span><span style="color: #0000BB">increment</span><span style="color: #007700">(&</span><span style="color: #0000BB">$var</span><span style="color: #007700">)<br />{<br /> </span><span style="color: #0000BB">$var</span><span style="color: #007700">++;<br />}<br /><br /></span><span style="color: #0000BB">$a </span><span style="color: #007700">= </span><span style="color: #0000BB">0</span><span style="color: #007700">;<br /></span><span style="color: #0000BB">call_user_func</span><span style="color: #007700">(</span><span style="color: #DD0000">'increment'</span><span style="color: #007700">, </span><span style="color: #0000BB">$a</span><span style="color: #007700">);<br />echo </span><span style="color: #0000BB">$a</span><span style="color: #007700">.</span><span style="color: #DD0000">"\n"</span><span style="color: #007700">;<br /><br /></span><span style="color: #0000BB">call_user_func_array</span><span style="color: #007700">(</span><span style="color: #DD0000">'increment'</span><span style="color: #007700">, array(&</span><span style="color: #0000BB">$a</span><span style="color: #007700">)); </span><span style="color: #FF8000">// You can use this instead before PHP 5.3<br /></span><span style="color: #007700">echo </span><span style="color: #0000BB">$a</span><span style="color: #007700">.</span><span style="color: #DD0000">"\n"</span><span style="color: #007700">;<br /></span><span style="color: #0000BB">?></span>
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</span>
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</pre></div>
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</div>
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<div class="example-contents"><p>以上例程会输出：</p></div>
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<div class="example-contents screen">
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<div class="cdata"><pre>
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0
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1
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</pre></div>
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</div>
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</div>
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</p>
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</p></blockquote>
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</dd>
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</dl>
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</p>
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</div>
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<div class="refsect1 returnvalues" id="refsect1-function.call-user-func-returnvalues">
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<h3 class="title">返回值</h3>
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<p class="para">
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返回回调函数的返回值。
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</p>
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</div>
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<div class="refsect1 changelog" id="refsect1-function.call-user-func-changelog">
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<h3 class="title">更新日志</h3>
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<p class="para">
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<table class="doctable informaltable">
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<thead>
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<tr>
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<th>版本</th>
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<th>说明</th>
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</tr>
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</thead>
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<tbody class="tbody">
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<tr>
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<td>5.3.0</td>
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<td>
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对面向对象里面的关键字的解析有所增强。在此之前，使用两个冒号来连接一个类和里面的一个方法，把它作为参数来作为回调函数的话，将会发出一个<strong><code>E_STRICT</code></strong>的警告，因为这个传入的参数被视为静态方法。
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</td>
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</tr>
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</tbody>
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</table>
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</p>
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</div>
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<div class="refsect1 examples" id="refsect1-function.call-user-func-examples">
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<h3 class="title">范例</h3>
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<p class="para">
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<div class="example" id="example-6189">
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<p><strong>Example #2 <span class="function"><strong>call_user_func()</strong></span> 的例子</strong></p>
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<div class="example-contents">
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<div class="phpcode"><pre><span style="color: #000000">
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<span style="color: #0000BB"><?php<br /></span><span style="color: #007700">function </span><span style="color: #0000BB">barber</span><span style="color: #007700">(</span><span style="color: #0000BB">$type</span><span style="color: #007700">)<br />{<br /> echo </span><span style="color: #DD0000">"You wanted a </span><span style="color: #0000BB">$type</span><span style="color: #DD0000"> haircut, no problem\n"</span><span style="color: #007700">;<br />}<br /></span><span style="color: #0000BB">call_user_func</span><span style="color: #007700">(</span><span style="color: #DD0000">'barber'</span><span style="color: #007700">, </span><span style="color: #DD0000">"mushroom"</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">call_user_func</span><span style="color: #007700">(</span><span style="color: #DD0000">'barber'</span><span style="color: #007700">, </span><span style="color: #DD0000">"shave"</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">?></span>
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</span>
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</pre></div>
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</div>
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<div class="example-contents"><p>以上例程会输出：</p></div>
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<div class="example-contents screen">
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<div class="cdata"><pre>
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You wanted a mushroom haircut, no problem
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You wanted a shave haircut, no problem
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</pre></div>
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</div>
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</div>
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<div class="example" id="example-6190">
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<p><strong>Example #3 <span class="function"><strong>call_user_func()</strong></span> 命名空间的使用</strong></p>
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<div class="example-contents">
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<div class="phpcode"><pre><span style="color: #000000">
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<span style="color: #0000BB"><?php<br /><br /></span><span style="color: #007700">namespace </span><span style="color: #0000BB">Foobar</span><span style="color: #007700">;<br /><br />class </span><span style="color: #0000BB">Foo </span><span style="color: #007700">{<br /> static public function </span><span style="color: #0000BB">test</span><span style="color: #007700">() {<br /> print </span><span style="color: #DD0000">"Hello world!\n"</span><span style="color: #007700">;<br /> }<br />}<br /><br /></span><span style="color: #0000BB">call_user_func</span><span style="color: #007700">(</span><span style="color: #0000BB">__NAMESPACE__ </span><span style="color: #007700">.</span><span style="color: #DD0000">'\Foo::test'</span><span style="color: #007700">); </span><span style="color: #FF8000">// As of PHP 5.3.0<br /></span><span style="color: #0000BB">call_user_func</span><span style="color: #007700">(array(</span><span style="color: #0000BB">__NAMESPACE__ </span><span style="color: #007700">.</span><span style="color: #DD0000">'\Foo'</span><span style="color: #007700">, </span><span style="color: #DD0000">'test'</span><span style="color: #007700">)); </span><span style="color: #FF8000">// As of PHP 5.3.0<br /><br /></span><span style="color: #0000BB">?></span>
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</span>
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</pre></div>
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</div>
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<div class="example-contents"><p>以上例程会输出：</p></div>
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<div class="example-contents screen">
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<div class="cdata"><pre>
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Hello world!
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Hello world!
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</pre></div>
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</div>
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</div>
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<div class="example" id="example-6191">
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<p><strong>Example #4 用<span class="function"><strong>call_user_func()</strong></span>来调用一个类里面的方法</strong></p>
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<div class="example-contents">
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<div class="phpcode"><pre><span style="color: #000000">
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<span style="color: #0000BB"><?php<br /><br /></span><span style="color: #007700">class </span><span style="color: #0000BB">myclass </span><span style="color: #007700">{<br /> static function </span><span style="color: #0000BB">say_hello</span><span style="color: #007700">()<br /> {<br /> echo </span><span style="color: #DD0000">"Hello!\n"</span><span style="color: #007700">;<br /> }<br />}<br /><br /></span><span style="color: #0000BB">$classname </span><span style="color: #007700">= </span><span style="color: #DD0000">"myclass"</span><span style="color: #007700">;<br /><br /></span><span style="color: #0000BB">call_user_func</span><span style="color: #007700">(array(</span><span style="color: #0000BB">$classname</span><span style="color: #007700">, </span><span style="color: #DD0000">'say_hello'</span><span style="color: #007700">));<br /></span><span style="color: #0000BB">call_user_func</span><span style="color: #007700">(</span><span style="color: #0000BB">$classname </span><span style="color: #007700">.</span><span style="color: #DD0000">'::say_hello'</span><span style="color: #007700">); </span><span style="color: #FF8000">// As of 5.2.3<br /><br /></span><span style="color: #0000BB">$myobject </span><span style="color: #007700">= new </span><span style="color: #0000BB">myclass</span><span style="color: #007700">();<br /><br /></span><span style="color: #0000BB">call_user_func</span><span style="color: #007700">(array(</span><span style="color: #0000BB">$myobject</span><span style="color: #007700">, </span><span style="color: #DD0000">'say_hello'</span><span style="color: #007700">));<br /><br /></span><span style="color: #0000BB">?></span>
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</span>
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</pre></div>
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</div>
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<div class="example-contents"><p>以上例程会输出：</p></div>
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<div class="example-contents screen">
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<div class="cdata"><pre>
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Hello!
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Hello!
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Hello!
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</pre></div>
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</div>
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</div>
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<div class="example" id="example-6192">
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<p><strong>Example #5 把完整的函数作为回调传入<span class="function"><strong>call_user_func()</strong></span></strong></p>
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<div class="example-contents">
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<div class="phpcode"><pre><span style="color: #000000">
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<span style="color: #0000BB"><?php<br />call_user_func</span><span style="color: #007700">(function(</span><span style="color: #0000BB">$arg</span><span style="color: #007700">) { print </span><span style="color: #DD0000">"[</span><span style="color: #0000BB">$arg</span><span style="color: #DD0000">]\n"</span><span style="color: #007700">; }, </span><span style="color: #DD0000">'test'</span><span style="color: #007700">); </span><span style="color: #FF8000">/* As of PHP 5.3.0 */<br /></span><span style="color: #0000BB">?></span>
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</span>
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</pre></div>
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</div>
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<div class="example-contents"><p>以上例程会输出：</p></div>
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<div class="example-contents screen">
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<div class="cdata"><pre>
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[test]
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</pre></div>
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</div>
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</div>
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</p>
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</div>
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<div class="refsect1 notes" id="refsect1-function.call-user-func-notes">
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<h3 class="title">注释</h3>
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<blockquote class="note"><p><strong class="note">Note</strong>: <p class="para">在函数中注册有多个回调内容时(如使用
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<span class="function"><strong>call_user_func()</strong></span> 与 <span class="function"><a href="call_user_func_array.html" class="function">call_user_func_array()</a></span>)，如在前一个回调中有未捕获的异常，其后的将不再被调用。</p></p></blockquote>
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</div>
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<div class="refsect1 seealso" id="refsect1-function.call-user-func-seealso">
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<h3 class="title">参见</h3>
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<p class="para">
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<ul class="simplelist">
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<li class="member"><span class="function"><a href="call_user_func_array.html" class="function" rel="rdfs-seeAlso">call_user_func_array()</a> - 调用回调函数，并把一个数组参数作为回调函数的参数</span></li>
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<li class="member"><span class="function"><a href="is_callable.html" class="function" rel="rdfs-seeAlso">is_callable()</a> - 检测参数是否为合法的可调用结构</span></li>
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<li class="member"><a href="language.pseudo-types.html#language.types.callback" class="link">callback</a> 类型的信息</li>
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<li class="member"><span class="methodname"><a href="reflectionfunction.invoke.html" class="methodname" rel="rdfs-seeAlso">ReflectionFunction::invoke()</a> - Invokes function</span></li>
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<li class="member"><span class="methodname"><a href="reflectionmethod.invoke.html" class="methodname" rel="rdfs-seeAlso">ReflectionMethod::invoke()</a> - Invoke</span></li>
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</ul>
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</p>
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</div>
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</div></div></div></body></html> |