<?
$GenerationBegin = explode(' ', microtime());
$GenerationBegin = $GenerationBegin[0] + $GenerationBegin[1];
function GenerationTime()
{
    global $GenerationBegin;
    $GenerationEnd = explode(' ', microtime());
    $GenerationEnd = $GenerationEnd[0] + $GenerationEnd[1];
    $GenerationTotal = $GenerationEnd - $GenerationBegin;
    $GenerationTotal = round($GenerationTotal, 3);
    print "$GenerationTotal";
}
..................
GenerationTime();
?>