数据库日期转换为时间戳

$data=O::select('created_at','total')    ->get()->toArray(); //将数据库中的订单创建时间转换为时间戳foreach($data as $v){        if(!empty($v)) {        preg_match_all('/\d/', $v, $sh_arr);   //$v是字符串        $timerlist = implode('', $sh_arr[0]);        $timerlist = strtotime($timerlist);    }    $hours[] = $timerlist ;} //  dd($hours);