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<refentry id="function.array-search">
 <refnamediv>
  <refname>array_search</refname>
  <refpurpose>Searches the array for a given value and returns the corresponding key if successful</refpurpose>
 </refnamediv>
 <refsect1>
  <title>Description</title>
  <methodsynopsis>
   <type>mixed</type><methodname>array_search</methodname>
   <methodparam><type>mixed</type><parameter>needle</parameter></methodparam>
   <methodparam><type>array</type><parameter>haystack</parameter></methodparam>
   <methodparam choice="opt"><type>bool</type><parameter>strict</parameter></methodparam>
  </methodsynopsis>
  <para>
   Searches <parameter>haystack</parameter> for
   <parameter>needle</parameter> and returns the key if it is found in
   the array, &false; otherwise.
  </para>
  <note>
   <para>
    If <parameter>needle</parameter> is a string, the comparison is done
    in a case-sensitive manner.
   </para>
  </note>
  <note>
   <para>
    Prior to PHP 4.2.0, <function>array_search</function> returns
    &null; on failure instead of &false;.
   </para>
  </note>
  <para>
   If the optional third parameter <parameter>strict</parameter> is set to
   &true; then the <function>array_search</function>
   will also check the types of the <parameter>needle</parameter>
   in the <parameter>haystack</parameter>.
  </para>
  <para>
   If <parameter>needle</parameter> is found in
   <parameter>haystack</parameter> more than once, the first matching key
   is returned. To return the keys for all matching values, use
   <function>array_keys</function> with the optional
   <parameter>search_value</parameter> parameter instead.
  </para>
  <para>
   <example>
    <title><function>array_search</function> example</title>
    <programlisting role="php">
<![CDATA[
<?php
$array = array(0 => 'blue', 1 => 'red', 2 => 'green', 3 => 'red');

$key = array_search('green', $array); // $key = 2;
$key = array_search('red', $array);   // $key = 1;
?>
]]>
    </programlisting>
   </example>
  </para>
  &return.falseproblem;
  <para>
   See also <function>array_keys</function>,
   <function>array_values</function>,
   <function>array_key_exists</function>, and
   <function>in_array</function>.
  </para>
 </refsect1>
</refentry>

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