reference/funchand/functions/call-user-func.xml
2eb43ad4f41a8c62516abd804721786e50717af6
2eb43ad4f41a8c62516abd804721786e50717af6
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<methodsynopsis>
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<type>mixed</type><methodname>call_user_func</methodname>
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<methodparam><type>callable</type><parameter>callback</parameter></methodparam>
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<methodparam choice="opt"><type>mixed</type><parameter>parameter</parameter></methodparam>
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<methodparam choice="opt"><type>mixed</type><parameter>...</parameter></methodparam>
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<methodparam rep="repeat"><type>mixed</type><parameter>args</parameter></methodparam>
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</methodsynopsis>
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<para>
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Calls the <parameter>callback</parameter> given by the first parameter and passes
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><parameter>parameter</parameter></term>
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<term><parameter>args</parameter></term>
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<listitem>
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<para>
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Zero or more parameters to be passed to the callback.
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call_user_func('increment', $a);
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echo $a."\n";
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// You can use this instead
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// it is possible to use this instead
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call_user_func_array('increment', array(&$a));
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echo $a."\n";
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// it is also possible to use a variable function
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$increment = 'increment';
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$increment($a);
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echo $a."\n";
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?>
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]]>
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</programlisting>
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&example.outputs;
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<screen>
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<![CDATA[
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Warning: Parameter 1 to increment() expected to be a reference, value given in …
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0
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1
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]]>
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</screen>
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</example>
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</para>
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</refsect1>
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<refsect1 role="changelog">
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&reftitle.changelog;
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<para>
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<informaltable>
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<tgroup cols="2">
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<thead>
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<row>
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<entry>&Version;</entry>
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<entry>&Description;</entry>
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</row>
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</thead>
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<tbody>
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<row>
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<entry>5.3.0</entry>
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<entry>
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The interpretation of object oriented keywords like <literal>parent</literal>
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and <literal>self</literal> has changed. Previously, calling them using the
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double colon syntax would emit an <constant>E_STRICT</constant> warning because
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they were interpreted as static.
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</entry>
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</row>
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</tbody>
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</tgroup>
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</informaltable>
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</para>
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</refsect1>
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<refsect1 role="examples">
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&reftitle.examples;
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<para>
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}
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}
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call_user_func(__NAMESPACE__ .'\Foo::test'); // As of PHP 5.3.0
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call_user_func(array(__NAMESPACE__ .'\Foo', 'test')); // As of PHP 5.3.0
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call_user_func(__NAMESPACE__ .'\Foo::test');
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call_user_func(array(__NAMESPACE__ .'\Foo', 'test'));
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?>
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]]>
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$classname = "myclass";
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call_user_func(array($classname, 'say_hello'));
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call_user_func($classname .'::say_hello'); // As of 5.2.3
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call_user_func($classname .'::say_hello');
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$myobject = new myclass();
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<programlisting role="php">
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<![CDATA[
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<?php
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call_user_func(function($arg) { print "[$arg]\n"; }, 'test'); /* As of PHP 5.3.0 */
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call_user_func(function($arg) { print "[$arg]\n"; }, 'test');
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?>
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]]>
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</programlisting>
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<simplelist>
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<member><function>call_user_func_array</function></member>
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<member><function>is_callable</function></member>
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<member>&seealso.callback;</member>
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<member><link linkend="functions.variable-functions">Variable functions</link></member>
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<member><methodname>ReflectionFunction::invoke</methodname></member>
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<member><methodname>ReflectionMethod::invoke</methodname></member>
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</simplelist>
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