PHP获取两个时间相差的年数、月数和天数

1. [代码][PHP]代码    

<?php
  //Get detail gap of year,month and days between two different time by vfhky 20130728
  $common = (time()-strtotime(get_option(&#39;swt_builddate&#39;)));
  $a = floor($common/86400/360);	//整数年
  $b = floor($common/86400/30) - $a*12;	//整数月
  $c = floor($common/86400) - $a*360 - $b*30;	//整数日
  $d = floor($common/86400);	//总的天数
  echo $a."年".$b."月".$c."日（共计".$d."天）";
?>