php计算运算周期

php计算运算周期

//计算毫秒数
	static function consuming($name='window',$round=null){
		static $db=array();
		if(is_int($name)){
			$round=$name;
			$name='window';
		}
		$mt=microtime(true);
		if('window'==$name){
			$time=$mt-$_SERVER['REQUEST_TIME_FLOAT'];
		}else{
			$time=$mt-(isset($db[$name])?$db[$name]:$_SERVER['REQUEST_TIME_FLOAT']);
			$db[$name]=$mt;
		}
		return is_int($round)?round($time*1000,$round).' ms':$time;
	}