Check if ArrayCollection is empty

问题

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->getSuppliers();

I tried:

if(!($suppliers)) {}
if(empty($suppliers)) {}

Any ideas?

回答1:

Doctrine ArrayCollection has a method isEmpty that will do what you are looking for.

if ($suppliers->isEmpty()) { }

Take a look at the documentation for it here

回答2:

You can also use the count() PHP function:

if (count($suppliers) < 1) { }

来源：https://stackoverflow.com/questions/17643047/check-if-arraycollection-is-empty