Laravel : array_push not working in collection->each() iterator [duplicate]

Question

I have grouped collection and I iterate it using each() function.Inside the each function I want to add element to some array.But it is not working.Any idea?

$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 version : 8.35.1

What would the //ERRORs be?

user8034901
– user8034901

2021-05-21 09:39:27 +00:00
Commented May 21, 2021 at 9:39 — user8034901
– user8034901, Commented May 21, 2021 at 9:39

boppy · Accepted Answer · 2021-05-21 12:29:38Z

6

You need to pass the array to the function with use:

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

Pass-by-reference (&) is needed as long as $dataSet1 is not an object instance.

edited May 21, 2021 at 12:29

answered May 21, 2021 at 9:39

boppy

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1 Comment

Dmytro Over a year ago

Be aware that arrow functions, i.e. the shorthand fn syntax, do not modify the variables from outer scope as stated in the PHP manual (see Example #4). It will work though if you're modifying an object since it's always passed by reference.

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