php - How can I iterate over each record in collection while also manipulating another collection?

one text

Solution:

Why don't you try adding an ampersand before $tickets on the use:

$prizes = Prize::all()->limit(5)->get();
$tickets = Tickets::all()->limit(5)->get();

// iterate over runner up prizes
$prizes->each(function ($prize, $key) use(&$tickets) {
    // select ticket from bag
    $winner = $tickets->random();
    // assign to prize
    $prize->ticket_winner_id = $winner->id;
    // remove id from remainder
    $tickets = $tickets->except($winner->id);
});

That would say to php that you don't want a copy of that variable and you want to mutate it.