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<?xml version="1.0" encoding="iso-8859-1"?>
<!-- $Revision: 1.20 $ -->
<refentry xml:id="function.call-user-func-array" xmlns="http://docbook.org/ns/docbook">
<refnamediv>
<refname>call_user_func_array</refname>
<refpurpose>Call a user function given with an array of parameters</refpurpose>
</refnamediv>
<refsect1 role="description">
&reftitle.description;
<methodsynopsis>
<type>mixed</type><methodname>call_user_func_array</methodname>
<methodparam><type>callback</type><parameter>function</parameter></methodparam>
<methodparam><type>array</type><parameter>param_arr</parameter></methodparam>
</methodsynopsis>
<para>
Call a user defined <parameter>function</parameter> with the parameters in
<parameter>param_arr</parameter>.
</para>
</refsect1>
<refsect1 role="parameters">
&reftitle.parameters;
<para>
<variablelist>
<varlistentry>
<term><parameter>function</parameter></term>
<listitem>
<para>
The function to be called.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><parameter>param_arr</parameter></term>
<listitem>
<para>
The parameters to be passed to the function, as an indexed array.
</para>
</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_array</function> example</title>
<programlisting role="php">
<![CDATA[
<?php
function debug($var, $val)
{
echo "***DEBUGGING\nVARIABLE: $var\nVALUE:";
if (is_array($val) || is_object($val) || is_resource($val)) {
print_r($val);
} else {
echo "\n$val\n";
}
echo "***\n";
}
$c = mysql_connect();
$host = $_SERVER["SERVER_NAME"];
call_user_func_array('debug', array("host", $host));
call_user_func_array('debug', array("c", $c));
call_user_func_array('debug', array("_POST", $_POST));
?>
]]>
</programlisting>
</example>
<example>
<title><function>call_user_func_array</function> using namespace name</title>
<programlisting role="php">
<![CDATA[
<?php
namespace Foobar;
class Foo {
static public function test($name) {
print "Hello {$name}!\n";
}
}
// As of PHP 5.3.0
call_user_func_array(__NAMESPACE__ .'::Foo::test', array('Hannes'));
// Hello Hannes!
// As of PHP 5.3.0
call_user_func_array(array(__NAMESPACE__ .'::Foo', 'test'), array('Philip'));
// Hello Philip!
?>
]]>
</programlisting>
</example>
<example>
<title>Using lambda function</title>
<programlisting role="php">
<![CDATA[
<?php
$func = function($arg1, $arg2) {
return $arg1 * $arg2;
};
var_dump(call_user_func($func, 2, 4)); /* As of PHP 5.3.0 */
// int(8)
?>
]]>
</programlisting>
</example>
</para>
</refsect1>
<refsect1 role="notes">
&reftitle.notes;
<note>
<para>
Referenced variables in <parameter>param_arr</parameter> are passed to the
function by a reference, others are passed by a value. In other words, it
does not depend on the function signature whether the parameter is passed
by a value or by a reference.
</para>
</note>
</refsect1>
<refsect1 role="seealso">
&reftitle.seealso;
<para>
<simplelist>
<member><function>call_user_func</function></member>
<member>&seealso.callback;</member>
</simplelist>
</para>
</refsect1>
</refentry>
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