php-doc-en/reference/funchand/functions/func-get-args.xml

<?xml version="1.0" encoding="utf-8"?>
<!-- $Revision$ -->
<refentry xml:id="function.func-get-args" xmlns="http://docbook.org/ns/docbook">
 <refnamediv>
  <refname>func_get_args</refname>
  <refpurpose>Returns an array comprising a function's argument list</refpurpose>
 </refnamediv>
 
 <refsect1 role="description">
  &reftitle.description;
  <methodsynopsis>
   <type>array</type><methodname>func_get_args</methodname>
   <void/>
  </methodsynopsis>
  <para>
   Gets an array of the function's argument list.
  </para>
  <para>
   This function may be used in conjunction with 
   <function>func_get_arg</function> and <function>func_num_args</function>
   to allow user-defined functions to accept variable-length argument lists.
  </para>
 </refsect1>

 <refsect1 role="returnvalues">
  &reftitle.returnvalues;
  <para>
   Returns an array in which each element is a copy of the corresponding
   member of the current user-defined function's argument list. 
  </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>
        This function can now be used in parameter lists.
       </entry>
      </row>
      <row>
       <entry>5.3.0</entry>
       <entry>
        If this function is called from the outermost scope of a file
        which has been included by calling <function>include</function>
        or <function>require</function> from within a function in the
        calling file, it now generates a warning and returns &false;.
       </entry>
      </row>
     </tbody>
    </tgroup>
   </informaltable>
  </para>
 </refsect1>

 <refsect1 role="errors">
  &reftitle.errors;
  <para>
   Generates a warning if called from outside of a user-defined function.
  </para>
 </refsect1>

 <refsect1 role="examples">
  &reftitle.examples;
  <para>
   <example>
    <title><function>func_get_args</function> example</title>
    <programlisting role="php">
<![CDATA[
<?php
function foo()
{
    $numargs = func_num_args();
    echo "Number of arguments: $numargs<br />\n";
    if ($numargs >= 2) {
        echo "Second argument is: " . func_get_arg(1) . "<br />\n";
    }
    $arg_list = func_get_args();
    for ($i = 0; $i < $numargs; $i++) {
        echo "Argument $i is: " . $arg_list[$i] . "<br />\n";
    }
}

foo(1, 2, 3);
?>
]]>
    </programlisting>
    &example.outputs;
    <screen>
<![CDATA[
Number of arguments: 3<br />
Second argument is: 2<br />
Argument 0 is: 1<br />
Argument 1 is: 2<br />
Argument 2 is: 3<br />
]]>
    </screen>
   </example>
  </para>
  <para>
   <example>
    <title><function>func_get_args</function> example before and
    after PHP 5.3</title>
    <programlisting role="php">
<![CDATA[
test.php
<?php
function foo() {
    include './fga.inc';
}

foo('First arg', 'Second arg');
?>

fga.inc
<?php

$args = func_get_args();
var_export($args);

?>
]]>
    </programlisting>
    <para>
     Output previous to PHP 5.3:
    </para>
    <screen>
<![CDATA[
array (
  0 => 'First arg',
  1 => 'Second arg',
)
]]>
    </screen>
    <para>
     Output in PHP 5.3 and later:
    </para>
    <screen>
<![CDATA[
Warning: func_get_args():  Called from the global scope - no function
context in /home/torben/Desktop/code/ml/fga.inc on line 3
false
]]>
    </screen>
   </example>
  </para>
  <para>
   <example>
    <title><function>func_get_args</function> example of byref and byval arguments</title>
    <programlisting role="php">
<![CDATA[
<?php
function byVal($arg) {
    echo 'As passed     : ', var_export(func_get_args()), PHP_EOL;
    $arg = 'baz';
    echo 'After change  : ', var_export(func_get_args()), PHP_EOL;
}

function byRef(&$arg) {
    echo 'As passed     : ', var_export(func_get_args()), PHP_EOL;
    $arg = 'baz';
    echo 'After change  : ', var_export(func_get_args()), PHP_EOL;
}

$arg = 'bar';
byVal($arg);
byRef($arg);
?>
]]>
    </programlisting>
     &example.outputs;
    <screen>
As passed     : array (
  0 => 'bar',
)
After change  : array (
  0 => 'bar',
)
As passed     : array (
  0 => 'bar',
)
After change  : array (
  0 => 'baz',
)
    </screen>
   </example>
  </para>

 </refsect1>

 <refsect1 role="notes">
  &reftitle.notes;
  &note.funcnoparam;
  &note.funcbyref;
  <note>
   <simpara>
    This function returns a copy of the passed arguments only, and does not
    account for default (non-passed) arguments.
   </simpara>
  </note>
 </refsect1>

 <refsect1 role="seealso">
  &reftitle.seealso;
  <para>
   <simplelist>
    <member><function>func_get_arg</function></member>
    <member><function>func_num_args</function></member>
    <member><methodname>ReflectionFunctionAbstract::getParameters</methodname></member>
   </simplelist>
  </para>
 </refsect1>

</refentry>

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