You are browsing a version that is no longer maintained.
Maintained
3.0 (upcoming) 2.4 (upcoming) 2.3.0 (current)
Unmaintained
2.2 2.1 2.0 1.8 1.7 1.6

Serialization

Using (un-)serialize() on a collection is not a supported use-case and may break when changes on the collection's internals happen in the future. If a collection needs to be serialized, use toArray() and reconstruct the collection manually.

$collection = new ArrayCollection([1, 2, 3]);$serialized = serialize($collection->toArray());

A reconstruction is also necessary when the collection contains objects with infinite recursion of dependencies like in this json_serialize() example:

$foo = new Foo();$bar = new Bar();$foo->setBar($bar);$bar->setFoo($foo);$collection = new ArrayCollection([$foo]);$json       = json_serialize($collection->toArray()); // recursion detected

Serializer libraries can be used to create the serialization-output to prevent errors.