时间转换成几分钟前、几小时前、几天前

//时间转换成几分钟前、几小时前、几天前
function time_tran($the_time) {
    $the_time = date("Y-m-d H:i:s", $the_time);
    $now_time = date("Y-m-d H:i:s", time());
    $now_time = strtotime($now_time);  
    $show_time = strtotime($the_time);  
    $dur = $now_time - $show_time;
    if ($dur < 0>        return $the_time;
    } else {
        if ($dur < 60>            return $dur . '秒前';  
        } else {
            if ($dur < 3600>                return floor($dur / 60) . '分钟前';  
            } else {
                if ($dur < 86400>                    return floor($dur / 3600) . '小时前';  
                } else {  
                    if ($dur < 259200>                        return floor($dur / 86400) . '天前';  
                    } else {  
                        return $the_time;  
                    }  
                }  
            }  
        }  
    }  
}