如何在php中转换[1,2,3]格式的数组

Question

我在 Laravel 工作并使用 orWhereIn() ，它采用 [1,2,3,4] 格式的数组。这就是我正在做的，但它转换为字符串：

$group_id=array()

$user_groups=ChatGroupMember::where('group_users_id',$login_user_id)->get();

foreach ($user_groups as $grp) {

    array_push($group_id,$grp->group_id);

}

$groupList = implode(',', $group_id);

dd($groupList);

Answer 1

只要使用$group_ids的whereIn是OK。$group_ids=array();$user_groups=ChatGroupMember::where('group_users_id',$login_user_id)->get();foreach ($user_groups as $grp) {    array_push($group_ids,$grp->group_id);}.........whereIn('id', $group_ids); // ......whereIn('id', "[" . join(",",$group_ids) . "]");   // if it accept a string rather than an array.