function.call-user-func.html
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><html> <head> <title>Call a user function given by the first parameter</title> <meta http-equiv="content-type" content="text/html; charset=UTF-8"> </head> <body><div style="text-align: center;"> <div class="prev" style="text-align: left; float: left;"><a href="function.call-user-func-array.html">call_user_func_array</a></div> <div class="next" style="text-align: right; float: right;"><a href="function.create-function.html">create_function</a></div> <div class="up"><a href="ref.funchand.html">Function handling Functions</a></div> <div class="home"><a href="index.html">PHP Manual</a></div></div><hr /><div id="function.call-user-func" class="refentry"> <div class="refnamediv"> <h1 class="refname">call_user_func</h1> <p class="verinfo">(PHP 4, PHP 5)</p><p class="refpurpose"><span class="refname">call_user_func</span> — <span class="dc-title">Call a user function given by the first parameter</span></p> </div> <div class="refsect1 description"> <h3 class="title">Description</h3> <div class="methodsynopsis dc-description"> <span class="type"><a href="language.pseudo-types.html#language.types.mixed" class="type mixed">mixed</a></span> <span class="methodname"><b><b>call_user_func</b></b></span> ( <span class="methodparam"><span class="type"><a href="language.pseudo-types.html#language.types.callback" class="type callback">callback</a></span> <tt class="parameter">$function</tt></span> [, <span class="methodparam"><span class="type"><a href="language.pseudo-types.html#language.types.mixed" class="type mixed">mixed</a></span> <tt class="parameter">$parameter</tt></span> [, <span class="methodparam"><span class="type"><a href="language.pseudo-types.html#language.types.mixed" class="type mixed">mixed</a></span> <tt class="parameter">$...</tt></span> ]] )</div> <p class="para rdfs-comment"> Call a user defined function given by the <i><tt class="parameter">function</tt></i> parameter. </p> </div> <div class="refsect1 parameters"> <h3 class="title">Parameters</h3> <p class="para"> <dl> <dt> <span class="term"><i><tt class="parameter">function</tt></i></span> <dd> <p class="para"> The function to be called. Class methods may also be invoked statically using this function by passing <i>array($classname, $methodname)</i> to this parameter. </p> </dd> </dt> <dt> <span class="term"><i><tt class="parameter">parameter</tt></i></span> <dd> <p class="para"> Zero or more parameters to be passed to the function. </p> <blockquote><p><b class="note">Note</b>: Note that the parameters for <b>call_user_func()</b> are not passed by reference. <div class="informalexample"> <div class="example-contents"><div class="phpcode"><code><span style="color: #000000"><span style="color: #0000BB"><?php<br /></span><span style="color: #007700">function </span><span style="color: #0000BB">increment</span><span style="color: #007700">(&</span><span style="color: #0000BB">$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: #FF8000">// 0<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">$a</span><span style="color: #007700">)); </span><span style="color: #FF8000">// You can use this instead<br /></span><span style="color: #007700">echo </span><span style="color: #0000BB">$a</span><span style="color: #007700">; </span><span style="color: #FF8000">// 1<br /></span><span style="color: #0000BB">?></span></span></code></div> </div> </div> <br /> </p></blockquote> </dd> </dt> </dl> </p> </div> <div class="refsect1 returnvalues"> <h3 class="title">Return Values</h3> <p class="para"> Returns the function result, or <b><tt>FALSE</tt></b> on error. </p> </div> <div class="refsect1 examples"> <h3 class="title">Examples</h3> <p class="para"> <div class="example"> <p><b>Example #1 <b>call_user_func()</b> example</b></p> <div class="example-contents"><div class="phpcode"><code><span style="color: #000000"><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 $type haircut, no problem"</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></span></code></div> </div> </div> <div class="example"> <p><b>Example #2 <b>call_user_func()</b> using namespace name</b></p> <div class="example-contents"><div class="phpcode"><code><span style="color: #000000"><span style="color: #0000BB"><?php<br /><br />namespace 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 />// Hello world!<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 />// Hello world!<br /><br /></span><span style="color: #0000BB">?></span></span></code></div> </div> </div> <div class="example"> <p><b>Example #3 Using a class method</b></p> <div class="example-contents"><div class="phpcode"><code><span style="color: #000000"><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">?></span></span></code></div> </div> </div> <div class="example"> <p><b>Example #4 Using lambda function</b></p> <div class="example-contents"><div class="phpcode"><code><span style="color: #000000"><span style="color: #0000BB"><?php<br /><br />call_user_func</span><span style="color: #007700">(function(</span><span style="color: #0000BB">$arg</span><span style="color: #007700">) { print </span><span style="color: #DD0000">"[$arg]\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 />// [test]<br /><br /></span><span style="color: #0000BB">?></span></span></code></div> </div> </div> </p> </div> <div class="refsect1 seealso"> <h3 class="title">See Also</h3> <p class="para"> <ul class="simplelist"> <li class="member"><a href="function.call-user-func-array.html" class="function" rel="rdfs-seeAlso">call_user_func_array()</a></li> <li class="member"><a href="function.is-callable.html" class="function" rel="rdfs-seeAlso">is_callable()</a></li> <li class="member">information about the <a href="language.pseudo-types.html#language.types.callback" class="link">callback</a> type</li> </ul> </p> </div></div><hr /><div style="text-align: center;"> <div class="prev" style="text-align: left; 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