计算两个时间相差的天，时，分，秒

$d = "2012-05-22 15:30:10";function shi_jian_cha($d,$d1){        $time = strtotime($d) - strtotime($d1);	    $n_time = str_pad(floor($time/3600/24),2,0,STR_PAD_LEFT )."天".str_pad(floor($time%(24*3600)/3600),2<span style="color:transparent">/本文来源gaodai#ma#com搞*!代#%^码网%</span><sub>搞代gaodaima码</sub>,0,STR_PAD_LEFT )."小时".str_pad(floor($time%3600/60),2,0,STR_PAD_LEFT)."分".str_pad($time%3600%60, 2, 0, STR_PAD_LEFT)."秒";    return $n_time;}