<?xml version="1.0" encoding="iso-8859-1"?>
<!-- $Revision: 1.6 $ -->
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  <refentry id="function.array-key-exists">
   <refnamediv>
    <refname>array_key_exists</refname>
    <refpurpose>Checks if the given key or index exists in the array</refpurpose>
   </refnamediv>
   <refsect1>
    <title>Description</title>
     <methodsynopsis>
      <type>bool</type><methodname>array_key_exists</methodname>
      <methodparam><type>mixed</type><parameter>key</parameter></methodparam>
      <methodparam><type>array</type><parameter>search</parameter></methodparam>
     </methodsynopsis>
    <para>
     <function>array_key_exists</function> returns &true; if the
     given <parameter>key</parameter> is set in the array.
     <parameter>key</parameter> can be any value possible
     for an array index.
    </para>
    <para>
     <example>
      <title><function>array_key_exists</function> example</title>
      <programlisting role="php">
<![CDATA[
<?php
$search_array = array("first" => 1, "second" => 4);
if (array_key_exists("first", $search_array)) {
    echo "The 'first' element is in the array";
}
?>
]]>
      </programlisting>
     </example>
    </para>
    <note>
     <simpara>
      The name of this function is <function>key_exists</function>
      in PHP version 4.0.6.
     </simpara>
    </note>
    <para>
     See also <function>isset</function>.
    </para>
   </refsect1>
  </refentry>

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