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<refentry xml:id="function.get-defined-vars" xmlns="http://docbook.org/ns/docbook">
 <refnamediv>
  <refname>get_defined_vars</refname>
  <refpurpose>
   Returns an array of all defined variables
  </refpurpose>
 </refnamediv>
 <refsect1 role="description">
  &reftitle.description;
  <methodsynopsis>
   <type>array</type><methodname>get_defined_vars</methodname>
   <void/>
  </methodsynopsis>
  <para>
   This function returns a multidimensional array containing a list of
   all defined variables, be them environment, server or user-defined
   variables, within the scope that <function>get_defined_vars</function> is
   called. 
  </para>
 </refsect1>
 <refsect1 role="parameters">
  &reftitle.parameters;
  &no.function.parameters;
 </refsect1>
 <refsect1 role="returnvalues">
  &reftitle.returnvalues;
  <para>
   A multidimensional array with all the variables.
  </para>
 </refsect1>
 <refsect1 role="examples">
  &reftitle.examples;
  <para>
   <example>
    <title><function>get_defined_vars</function> Example</title>
    <programlisting role="php">
<![CDATA[
<?php
$b = array(1, 1, 2, 3, 5, 8);

$arr = get_defined_vars();

// print $b
print_r($arr["b"]);

/* print path to the PHP interpreter (if used as a CGI)
 * e.g. /usr/local/bin/php */
echo $arr["_"];

// print the command-line parameters if any
print_r($arr["argv"]);

// print all the server vars
print_r($arr["_SERVER"]);

// print all the available keys for the arrays of variables
print_r(array_keys(get_defined_vars()));
?>
]]>
    </programlisting>
   </example>
  </para>
 </refsect1>
 <refsect1 role="seealso">
  &reftitle.seealso;
  <para>
   <simplelist>
    <member><function>isset</function></member>
    <member><function>get_defined_functions</function></member>
    <member><function>get_defined_constants</function></member>
   </simplelist>
  </para>
 </refsect1>
</refentry>

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