php-doc-en/reference/gmp/examples.xml

<?xml version="1.0" encoding="utf-8"?>
<!-- $Revision$ -->
<chapter xml:id="gmp.examples">
 &reftitle.examples;
 <para>
  <example>
   <title>Factorial function using GMP</title>
   <programlisting role="php">
<![CDATA[
<?php
function fact($x) 
{
    $return = 1;
    for ($i=2; $i <= $x; $i++) {
        $return = gmp_mul($return, $i);
    }
    return $return;
}

echo gmp_strval(fact(1000)) . "\n";
?>
]]>
   </programlisting>
  </example>
 </para>
 <para>
  This will calculate factorial of 1000 (pretty big number)
  very fast.
 </para>
</chapter>
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