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<?xml version="1.0" encoding="iso-8859-1"?>
<!-- $Revision: 1.14 $ -->
<!-- splitted from ./en/functions/funchand.xml, last change in rev 1.1 -->
<refentry id="function.call-user-func">
<refnamediv>
<refname>call_user_func</refname>
<refpurpose>
Call a user function given by the first parameter
</refpurpose>
</refnamediv>
<refsect1>
<title>Description</title>
<methodsynopsis>
<type>mixed</type><methodname>call_user_func</methodname>
<methodparam><type>callback</type><parameter>function</parameter></methodparam>
<methodparam choice="opt"><type>mixed</type><parameter>parameter</parameter></methodparam>
<methodparam choice="opt"><type>mixed</type><parameter>...</parameter></methodparam>
</methodsynopsis>
<para>
Call a user defined function given by the
<parameter>function</parameter> parameter. Take the
following:
</para>
<para>
<informalexample>
<programlisting role="php">
<![CDATA[
<?php
function barber($type)
{
echo "You wanted a $type haircut, no problem";
}
call_user_func('barber', "mushroom");
call_user_func('barber', "shave");
?>
]]>
</programlisting>
</informalexample>
</para>
<para>
Class methods may also be invoked statically using this function
by passing <literal>array($classname, $methodname)</literal> to
the <parameter>function</parameter> parameter.
<informalexample>
<programlisting role="php">
<![CDATA[
<?php
class myclass {
function say_hello()
{
echo "Hello!\n";
}
}
$classname = "myclass";
call_user_func(array($classname, 'say_hello'));
?>
]]>
</programlisting>
</informalexample>
</para>
<note>
<para>
Note that the parameters for <function>call_user_func</function> are not
passed by reference.
<informalexample>
<programlisting role="php">
<![CDATA[
<?php
function increment(&$var)
{
$var++;
}
$a = 0;
call_user_func('increment', $a);
echo $a; // 0
call_user_func_array('increment', array(&$a)); // You can use this instead
echo $a; // 1
?>
]]>
</programlisting>
</informalexample>
</para>
</note>
<para>
See also:
<function>is_callable</function>,
<function>call_user_func_array</function>,
&listendand; &seealso.callback;.
</para>
</refsect1>
</refentry>
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