Client-side time with PHP and JS

clientSide.php

if(!$_REQUEST["client_time"])
{
	$vars = "?";
	foreach($_REQUEST as $key => $val) {
		$vars .= $key."=".$val."&";
	}
    echo "<script type=\"text/javascript\">";
    echo "localtime = new Date();";
    echo "document.location.href = '".$PHP_SELF.$vars."client_time='
            + localtime.getTime();";
    echo "</script>";
}
else
{
    // Process page as normal
}