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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>
      Prior to PHP 4.2.0, <function>array_search</function> returns
      <constant>NULL</constant> 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>
    &return.falseproblem;
    <para>
     See also <function>array_keys</function> and <function>in_array</function>.
    </para>
   </refsect1>
  </refentry>

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