//返回当前的毫秒时间戳(无小数)
function msectime() {
	list($msec, $sec) = explode(' ', microtime());
	return (float)sprintf('%.0f', (floatval($msec) + floatval($sec)) * 1000);
}
//返回当前的毫秒时间戳(有小数)
function msectime() {
	list($usec, $sec) = explode(" ", microtime());
	return ((float)$usec + (float)$sec);
}