php-doc-en/reference/array/functions/shuffle.xml

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  <refentry id="function.shuffle">
   <refnamediv>
    <refname>shuffle</refname>
    <refpurpose>Shuffle an array</refpurpose>
   </refnamediv>
   <refsect1>
    <title>Description</title>
     <methodsynopsis>
      <type>bool</type><methodname>shuffle</methodname>
      <methodparam><type>array</type><parameter>array</parameter></methodparam>
     </methodsynopsis>
    <para>
     This function shuffles (randomizes the order of the elements in)
     an array. 
     <example>
      <title><function>shuffle</function> example</title>
      <programlisting role="php">
<![CDATA[
<?php
$numbers = range(1, 20);
srand((float)microtime() * 1000000);
shuffle($numbers);
while (list(, $number) = each($numbers)) {
    echo "$number ";
}
?>
]]>
      </programlisting>
     </example>
    </para>
    
    &note.randomseed;
    
    <para>
     See also <function>arsort</function>, <function>asort</function>,
     <function>ksort</function>, <function>rsort</function>,
     <function>sort</function>, and <function>usort</function>.
    </para>
   </refsect1>
  </refentry>

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