php倒计时方法 返回数据前补0或补位(已封装)
public static function countDown($time){
$current_time=time();
$remain = $time-$current_time;
$day= intval($remain/86400);;//天
$remains = $remain%86400;
$hour = intval($remains/3600);
//计算分钟数
$remain1 = $remain%3600;
$minute = intval($remain1/60);
//计算秒数
$second = $remain%60;
return sprintf("%02d", $day)."天".sprintf("%02d", $hour).':'.sprintf("%02d", $minute).':'.sprintf("%02d", $second).":";
}