php-doc-en/reference/funchand/functions/call-user-func-array.xml

<?xml version="1.0" encoding="utf-8"?>
<!-- $Revision$ -->
<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="changelog">
  &reftitle.changelog;
  <para>
   <informaltable>
    <tgroup cols="2">
     <thead>
      <row>
       <entry>&Version;</entry>
       <entry>&Description;</entry>
      </row>
     </thead>
     <tbody>
      <row>
       <entry>5.3.0</entry>
       <entry>
        The interpretation of object oriented keywords like <literal>parent</literal> 
        and <literal>self</literal> has changed. Previously, calling them using the 
        double colon syntax would emit an <constant>E_STRICT</constant> warning because 
        they were interpreted as static.
       </entry>
      </row>
     </tbody>
    </tgroup>
   </informaltable>
  </para>
 </refsect1>

 <refsect1 role="examples">
  &reftitle.examples;
  <para>
   <example>
    <title><function>call_user_func_array</function> example</title>
    <programlisting role="php">
<![CDATA[
<?php
function foobar($arg, $arg2) {
    echo __FUNCTION__, " got $arg and $arg2\n";
}
class foo {
    function bar($arg, $arg2) {
        echo __METHOD__, " got $arg and $arg2\n";
    }
}


// Call the foobar() function with 2 arguments
call_user_func_array("foobar", array("one", "two"));

// Call the $foo->bar() method with 2 arguments
$foo = new foo;
call_user_func_array(array($foo, "bar"), array("three", "four"));
?>
]]>
    </programlisting>
    &example.outputs.similar;
    <screen>
<![CDATA[
foobar got one and two
foo::bar got three and four
]]>
    </screen>
   </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'));

// As of PHP 5.3.0
call_user_func_array(array(__NAMESPACE__ .'\Foo', 'test'), array('Philip'));

?>
]]>
    </programlisting>
    &example.outputs.similar;
    <screen>
<![CDATA[
Hello Hannes!
Hello Philip!
]]>
    </screen>
   </example>
   <example>
    <title>Using lambda function</title>
    <programlisting role="php">
<![CDATA[
<?php

$func = function($arg1, $arg2) {
    return $arg1 * $arg2;
};

var_dump(call_user_func_array($func, array(2, 4))); /* As of PHP 5.3.0 */

?>
]]>
    </programlisting>
    &example.outputs;
    <screen>
<![CDATA[
int(8)
]]>
    </screen>
   </example>
  </para>
 </refsect1>

 <refsect1 role="notes">
  &reftitle.notes;
  <note>
   <para>
    Referenced variables in <parameter>param_arr</parameter> are passed to the
    function by reference, regardless of whether the function expects the
    respective parameter to be passed by reference. This form of call-time
    pass by reference does not emit a deprecation notice, but it is nonetheless
    deprecated, and will most likely be removed in the next version of PHP.
    Furthermore, this does not apply to internal functions, for which
    the function signature is honored. Passing by value when the function expects
    a parameter by reference results in a warning and having
    <function>call_user_func</function> return &false; (does not apply if the 
    passed value has a reference count = 1).
   </para>
  </note>
  &note.func-callback-exceptions;
 </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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