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<?xml version="1.0" encoding="iso-8859-1"?>
<!-- $Revision: 1.20 $ -->
<refentry xml:id="function.call-user-func" xmlns="http://docbook.org/ns/docbook">
<refnamediv>
<refname>call_user_func</refname>
<refpurpose>Call a user function given by the first parameter</refpurpose>
</refnamediv>
<refsect1 role="description">
&reftitle.description;
<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.
</para>
</refsect1>
<refsect1 role="parameters">
&reftitle.parameters;
<para>
<variablelist>
<varlistentry>
<term><parameter>function</parameter></term>
<listitem>
<para>
The function to be called. Class methods may also be invoked
statically using this function by passing
<literal>array($classname, $methodname)</literal> to this parameter.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><parameter>parameter</parameter></term>
<listitem>
<para>
Zero or more parameters to be passed to the function.
</para>
<note>
<para>
Note that the parameters for <function>call_user_func</function> are
not passed by reference.
<informalexample>
<programlisting role="php">
<![CDATA[
<?php
function increment(&$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 $a; // 1
?>
]]>
</programlisting>
</informalexample>
</para>
</note>
</listitem>
</varlistentry>
</variablelist>
</para>
</refsect1>
<refsect1 role="returnvalues">
&reftitle.returnvalues;
<para>
Returns the function result, or &false; on error.
</para>
</refsect1>
<refsect1 role="examples">
&reftitle.examples;
<para>
<example>
<title><function>call_user_func</function> example</title>
<programlisting role="php">
<![CDATA[
<?php
function barber($type)
{
echo "You wanted a $type haircut, no problem";
}
call_user_func('barber', "mushroom");
call_user_func('barber', "shave");
?>
]]>
</programlisting>
</example>
<example>
<title><function>call_user_func</function> using namespace name</title>
<programlisting role="php">
<![CDATA[
<?php
namespace Foobar;
class Foo {
static public function test() {
print "Hello world!\n";
}
}
call_user_func(__NAMESPACE__ .'::Foo::test'); // As of PHP 5.3.0
// Hello world!
call_user_func(array(__NAMESPACE__ .'::Foo', 'test')); // As of PHP 5.3.0
// Hello world!
?>
]]>
</programlisting>
</example>
<example>
<title>Using a class method</title>
<programlisting role="php">
<![CDATA[
<?php
class myclass {
static function say_hello()
{
echo "Hello!\n";
}
}
$classname = "myclass";
call_user_func(array($classname, 'say_hello'));
call_user_func($classname .'::say_hello'); // As of 5.2.3
?>
]]>
</programlisting>
</example>
<example>
<title>Using lambda function</title>
<programlisting role="php">
<![CDATA[
<?php
call_user_func(function($arg) { print "[$arg]\n"; }, 'test'); /* As of PHP 5.3.0 */
// [test]
?>
]]>
</programlisting>
</example>
</para>
</refsect1>
<refsect1 role="seealso">
&reftitle.seealso;
<para>
<simplelist>
<member><function>call_user_func_array</function></member>
<member><function>is_callable</function></member>
<member>&seealso.callback;</member>
</simplelist>
</para>
</refsect1>
</refentry>
<!-- Keep this comment at the end of the file
Local variables:
mode: sgml
sgml-omittag:t
sgml-shorttag:t
sgml-minimize-attributes:nil
sgml-always-quote-attributes:t
sgml-indent-step:1
sgml-indent-data:t
indent-tabs-mode:nil
sgml-parent-document:nil
sgml-default-dtd-file:"../../../../manual.ced"
sgml-exposed-tags:nil
sgml-local-catalogs:nil
sgml-local-ecat-files:nil
End:
vim600: syn=xml fen fdm=syntax fdl=2 si
vim: et tw=78 syn=sgml
vi: ts=1 sw=1
-->
|
