Question

我有sql命令，例如

$kos = DB::select('SELECT team,round,SUM(points) AS total from points WHERE round="first" GROUP by team ORDER BY total desc, run_rate desc limit 4');

当我dd($kos)会给我这个输出see here但是当我运行这个

$kos = DB::select('SELECT team,round,SUM(points) AS total from points WHERE round="first" GROUP by team ORDER BY total desc, run_rate desc limit 4');
foreach($kos as $ko){
        dd($ko->team);
}

它将给我这个输出see here 谁能告诉我为什么？

Answer 1

dd将转储传递的值并退出脚本的执行

在第一种情况下，您将集合传递给dd，它将转储整个集合并停止执行脚本

在第二种情况下，您处于第一个循环中，转储团队价值并停止执行

如果只想转储该值而不停止执行，则应调用dump函数

尝试

DB::select('SELECT team,round,SUM(points) AS total from points WHERE round="first" GROUP by team ORDER BY total desc, run_rate desc limit 4');
foreach($kos as $ko){
        dump($ko->team);
}

Actullay dd（）在Laravel中如何工作

1 个答案: