PHP 日期计算函数【差异天数】

function count_days($a,$b){
	$a_dt=getdate($a);
	$b_dt=getdate($b);
	$a_new=mktime(12,0,0,$a_dt['mon'],$a_dt['mday'],$a_dt['year']);
	$b_new=mktime(12,0,0,$b_dt['mon'],$b_dt['mday'],$b_dt['year']);
	return round(abs($a_new-$b_new)/86400);
}

　　调用方式：

count_days(strtotime($e_time),strtotime($x_time));