/*	$time_s 现在时间
	$time_n 开始时间
*/
function gettime($time_s,$time_n){
	$time_s =  strtotime($time_s);
	$time_n =  strtotime($time_n);
	$str='';
	$rest = $time_n - $time_s;
	if($rest>= 86400){
		//return $str='date("Y-m-d H:i:s",$time_s)';
		$str .= intval($rest/86400).'天';
		$rest = $rest % 86400;
	}else{
		$str .='';
	}
	if($rest>=3600){
		$str .= intval($rest/3600).'小时';
		$rest = $rest % 3600;
	}else{
		$str .='';
	}
	if($rest>=60){
		$str .= intval($rest/60).'分';
		$rest = $rest % 60;
	}else{
		$str .='';
	}
	if($rest>=0){
		$str .= intval($rest).'秒前';
	}else{
		$str ="已结束";
	}
	//json_encode(array('hour1'=>$remain_hour,'minute1'=>$remain_minute,'second1'=>$remain_second));
	return $str;
}