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  <refentry id="function.mt-srand">
   <refnamediv>
    <refname>mt_srand</refname>
    <refpurpose>Seed the better random number generator</refpurpose>
   </refnamediv>
   <refsect1>
    <title>Description</title>
     <methodsynopsis>
      <type>void</type><methodname>mt_srand</methodname>
      <methodparam><type>int</type><parameter>seed</parameter></methodparam>
     </methodsynopsis>
    <para>
     Seeds the random number generator with
     <parameter>seed</parameter>.
     <informalexample>
      <programlisting role="php">
<![CDATA[
// seed with microseconds
function make_seed() {
    list($usec, $sec) = explode(' ', microtime());
    return (float) $sec + ((float) $usec * 100000);
}
mt_srand(make_seed());
$randval = mt_rand();
]]>
      </programlisting>
     </informalexample>
    </para>
    <note>
     <para>
      Since PHP 4.2.0 it's no longer necessary to seed the random number
      generator before using it.
     </para>
    </note>
    <simpara>
     See also <function>mt_rand</function>,
     <function>mt_getrandmax</function> and <function>srand</function>.
    </simpara>
   </refsect1>
  </refentry>

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