I have an Entity Order which hold Suppliers in an Arraycollection. In my controller i want to check if this arraycollection is empty:
$suppliers = $order->get
You can also use the count() PHP function:
count()
if (count($suppliers) < 1) { }
Doctrine ArrayCollection has a method isEmpty that will do what you are looking for.
isEmpty
if ($suppliers->isEmpty()) { }
Take a look at the documentation for it here