function format_date($time){    $t = time-$time;    $f = array(        '31536000'=>'年前',        '2592000'=>'个月前',        '604800'=>'星期前',        '86400'=>'天前',        '3600'=>'小时前',        '60'=>'分钟前',        '1'=>'刚刚',    );        foreach($if as $k=>$v){        if(0 != $c = floor($t/(int)$k)){            return $v;        }    }}