Php/docs/migration53.classes
From Get docs
New Classes
The following classes were introduced in PHP 5.3.0:
Phar:
SPL:
- FilesystemIterator
- GlobIterator
- MultipleIterator
- RecursiveTreeIterator
- SplDoublyLinkedList
- SplFixedArray
- SplHeap
- SplMaxHeap
- SplMinHeap
- SplPriorityQueue
- SplQueue
- SplStack