我对集合进行了分组，并使用 each() 函数对其进行迭代。在每个函数中，我想将元素添加到某个数组中。但它不起作用。知道吗？

$dataSet1 = [];

$appointments = [
         ['department' => 'finance', 'product' => 'Chair'],
         ['department' => 'marketing', 'product' => 'Bookcase'],
         ['department' => 'finance', 'product' => 'Desk'],
]; 
$groupData = collect($appointments)->groupBy('department');

$groupData->each(function ($item, $key) {
   Log::info($key); //Show correct output in log
   array_push($dataSet1, $key); //ERROR
   array_push($dataSet1, 'A');//ERROR
});

Laravel 版本：8.35.1

回答

$groupData->each(function ($item, $key) use (&$dataSet1) {
   Log::info($key); //Show correct output in log
   array_push($dataSet1, $key); //ERROR
   array_push($dataSet1, 'A');//ERROR
});