Return Database Transactions Result

// 1. You can pass the parameter by reference
$invoice = NULL;
DB::transaction(function () use (&$invoice) {
    $invoice = Invoice::create(...);
    $invoice->items()->attach(...);
})
 
// 2. Or shorter: just return trasaction result
$invoice = DB::transaction(function () {
    $invoice = Invoice::create(...);
    $invoice->items()->attach(...);
 
    return $invoice;
});