php时间 显示刚刚 几分钟前等

功能示例：

$now = time();
foreach($sys_res as $k => $v){
    $day = intval(floor(($now - $v->system_time)/86400));
    $month = intval(floor(($now - $v->system_time)/(86400*30)));
    $year = intval(floor(($now - $v->system_time)/(86400*30*12)));
    if($year >= 1){
        $v->day = $year . '年前';
    }else if($month >=1 && $month < 12){
        $v->day = $month . '月前';
    }else{
        if($day>= 1){
            $v->day = $day . '天前';
        }else if($day < 1){
            $hour = intval(floor(($now - $v->system_time)/3600));
            if($hour >= 1){
                $v->day = $hour . '小时前';
            }else if($hour < 1){
                $minute = intval(floor(($now - $v->system_time)/60));
                if($minute >= 1){
                    $v->day = $minute . '分钟前';
                }else if($minute < 1){
                    $v->day =  '刚刚';
                }
            }
        }
    }
    $v->system_time = date('Y-m-d H:i:s',$v->system_time);
}