php获取两个时间戳之间相隔多少天多少小时多少分多少秒

public  function time_cha()
 {
         $s_date ="2015-12-12 16:00:00";
         $e_date ="2016-12-13 18:00:00";
       
         $cha = strtotime($e_date)-strtotime($s_date);
         
         //年
         $year = floor((strtotime($e_date)-strtotime($s_date)) / (31536000));
         echo "1、相差年数：".$year." 年<br/><br/>";
 
         //月
         $month = floor(($cha - $year * 31536000) / (2592000));
         $month_total = floor($cha  / 2592000);
         echo "2、相差月数：".$month." 月<br/><br/>";//除去年
         echo "3、相差月数：".$month_total." 月<br/><br/>";//总月数
 
         //日
         $day_total = floor((strtotime($e_date)-strtotime($s_date))/86400);
         echo "4、相差总天数：".$day_total." 天<br/><br/>";
 
         //时
         $hour = floor((strtotime($e_date)-strtotime($s_date))%86400/3600);
         $hour_total = floor((strtotime($e_date)-strtotime($s_date)));//总相差N小时
         echo "5、相差小时数：".$hour." 小时<br/><br/>";
         echo "6、相差总小时数：".$hour_total." 小时<br/><br/>";
 
         //分
         $minute = floor((strtotime($e_date)-strtotime($s_date))%86400/60);
         $minute_total = floor((strtotime($e_date)-strtotime($s_date))/60);
         echo "7、相差分钟数：".$minute."分钟<br/><br/>";
         echo "8、相差总分钟数：".$minute_total."分钟<br/><br/>";
 
         //秒
         $second = floor((strtotime($e_date)-strtotime($s_date))%86400%60);
         $second_total = floor((strtotime($e_date)-strtotime($s_date)));
         echo "9、相差秒数：".$second." 秒<br/><br/>";
         echo "10、相差总秒数：".$second_total." 秒<br/><br/>";
}