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<?xml version="1.0" encoding="utf-8"?>
<!-- $Revision: 297028 $ -->
<refentry xml:id="function.func-num-args" xmlns="http://docbook.org/ns/docbook">
<refnamediv>
<refname>func_num_args</refname>
<refpurpose>Returns the number of arguments passed to the function</refpurpose>
</refnamediv>
<refsect1 role="description">
&reftitle.description;
<methodsynopsis>
<type>int</type><methodname>func_num_args</methodname>
<void/>
</methodsynopsis>
<para>
Gets the number of arguments passed to the function.
</para>
<para>
This function may be used in conjunction with
<function>func_get_arg</function> and <function>func_get_args</function>
to allow user-defined functions to accept variable-length argument lists.
</para>
</refsect1>
<refsect1 role="returnvalues">
&reftitle.returnvalues;
<para>
Returns the number of arguments passed into the current user-defined
function.
</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 outtermost 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 -1.
</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_num_args</function> example</title>
<programlisting role="php">
<![CDATA[
<?php
function foo()
{
$numargs = func_num_args();
echo "Number of arguments: $numargs\n";
}
foo(1, 2, 3);
?>
]]>
</programlisting>
&example.outputs;
<screen>
<![CDATA[
Number of arguments: 3
]]>
</screen>
</example>
</para>
<para>
<example>
<title><function>func_num_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.php
<?php
$num_args = func_num_args();
var_export($num_args);
?>
]]>
</programlisting>
<para>
Output previous to PHP 5.3:
</para>
<screen>
<![CDATA[
2
]]>
</screen>
<para>
Output in PHP 5.3 and later:
</para>
<screen>
<![CDATA[
Warning: func_num_args(): Called from the global scope - no function
context in /home/torben/Desktop/code/ml/fga.inc on line 3
-1
]]>
</screen>
</example>
</para>
</refsect1>
<refsect1 role="notes">
&reftitle.notes;
¬e.funcnoparam;
</refsect1>
<refsect1 role="seealso">
&reftitle.seealso;
<para>
<simplelist>
<member><function>func_get_arg</function></member>
<member><function>func_get_args</function></member>
</simplelist>
</para>
</refsect1>
</refentry>
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-->
|
