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<?php print_r(spl_classes());
Output for 7.2.0 - 7.2.34, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
Array ( [AppendIterator] => AppendIterator [ArrayIterator] => ArrayIterator [ArrayObject] => ArrayObject [BadFunctionCallException] => BadFunctionCallException [BadMethodCallException] => BadMethodCallException [CachingIterator] => CachingIterator [CallbackFilterIterator] => CallbackFilterIterator [DirectoryIterator] => DirectoryIterator [DomainException] => DomainException [EmptyIterator] => EmptyIterator [FilesystemIterator] => FilesystemIterator [FilterIterator] => FilterIterator [GlobIterator] => GlobIterator [InfiniteIterator] => InfiniteIterator [InvalidArgumentException] => InvalidArgumentException [IteratorIterator] => IteratorIterator [LengthException] => LengthException [LimitIterator] => LimitIterator [LogicException] => LogicException [MultipleIterator] => MultipleIterator [NoRewindIterator] => NoRewindIterator [OuterIterator] => OuterIterator [OutOfBoundsException] => OutOfBoundsException [OutOfRangeException] => OutOfRangeException [OverflowException] => OverflowException [ParentIterator] => ParentIterator [RangeException] => RangeException [RecursiveArrayIterator] => RecursiveArrayIterator [RecursiveCachingIterator] => RecursiveCachingIterator [RecursiveCallbackFilterIterator] => RecursiveCallbackFilterIterator [RecursiveDirectoryIterator] => RecursiveDirectoryIterator [RecursiveFilterIterator] => RecursiveFilterIterator [RecursiveIterator] => RecursiveIterator [RecursiveIteratorIterator] => RecursiveIteratorIterator [RecursiveRegexIterator] => RecursiveRegexIterator [RecursiveTreeIterator] => RecursiveTreeIterator [RegexIterator] => RegexIterator [RuntimeException] => RuntimeException [SeekableIterator] => SeekableIterator [SplDoublyLinkedList] => SplDoublyLinkedList [SplFileInfo] => SplFileInfo [SplFileObject] => SplFileObject [SplFixedArray] => SplFixedArray [SplHeap] => SplHeap [SplMinHeap] => SplMinHeap [SplMaxHeap] => SplMaxHeap [SplObjectStorage] => SplObjectStorage [SplObserver] => SplObserver [SplPriorityQueue] => SplPriorityQueue [SplQueue] => SplQueue [SplStack] => SplStack [SplSubject] => SplSubject [SplTempFileObject] => SplTempFileObject [UnderflowException] => UnderflowException [UnexpectedValueException] => UnexpectedValueException )
Output for 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.40, 7.0.0 - 7.0.33, 7.1.0 - 7.1.33
Array ( [AppendIterator] => AppendIterator [ArrayIterator] => ArrayIterator [ArrayObject] => ArrayObject [BadFunctionCallException] => BadFunctionCallException [BadMethodCallException] => BadMethodCallException [CachingIterator] => CachingIterator [CallbackFilterIterator] => CallbackFilterIterator [Countable] => Countable [DirectoryIterator] => DirectoryIterator [DomainException] => DomainException [EmptyIterator] => EmptyIterator [FilesystemIterator] => FilesystemIterator [FilterIterator] => FilterIterator [GlobIterator] => GlobIterator [InfiniteIterator] => InfiniteIterator [InvalidArgumentException] => InvalidArgumentException [IteratorIterator] => IteratorIterator [LengthException] => LengthException [LimitIterator] => LimitIterator [LogicException] => LogicException [MultipleIterator] => MultipleIterator [NoRewindIterator] => NoRewindIterator [OuterIterator] => OuterIterator [OutOfBoundsException] => OutOfBoundsException [OutOfRangeException] => OutOfRangeException [OverflowException] => OverflowException [ParentIterator] => ParentIterator [RangeException] => RangeException [RecursiveArrayIterator] => RecursiveArrayIterator [RecursiveCachingIterator] => RecursiveCachingIterator [RecursiveCallbackFilterIterator] => RecursiveCallbackFilterIterator [RecursiveDirectoryIterator] => RecursiveDirectoryIterator [RecursiveFilterIterator] => RecursiveFilterIterator [RecursiveIterator] => RecursiveIterator [RecursiveIteratorIterator] => RecursiveIteratorIterator [RecursiveRegexIterator] => RecursiveRegexIterator [RecursiveTreeIterator] => RecursiveTreeIterator [RegexIterator] => RegexIterator [RuntimeException] => RuntimeException [SeekableIterator] => SeekableIterator [SplDoublyLinkedList] => SplDoublyLinkedList [SplFileInfo] => SplFileInfo [SplFileObject] => SplFileObject [SplFixedArray] => SplFixedArray [SplHeap] => SplHeap [SplMinHeap] => SplMinHeap [SplMaxHeap] => SplMaxHeap [SplObjectStorage] => SplObjectStorage [SplObserver] => SplObserver [SplPriorityQueue] => SplPriorityQueue [SplQueue] => SplQueue [SplStack] => SplStack [SplSubject] => SplSubject [SplTempFileObject] => SplTempFileObject [UnderflowException] => UnderflowException [UnexpectedValueException] => UnexpectedValueException )
Output for 5.3.0 - 5.3.29
Array ( [AppendIterator] => AppendIterator [ArrayIterator] => ArrayIterator [ArrayObject] => ArrayObject [BadFunctionCallException] => BadFunctionCallException [BadMethodCallException] => BadMethodCallException [CachingIterator] => CachingIterator [Countable] => Countable [DirectoryIterator] => DirectoryIterator [DomainException] => DomainException [EmptyIterator] => EmptyIterator [FilesystemIterator] => FilesystemIterator [FilterIterator] => FilterIterator [GlobIterator] => GlobIterator [InfiniteIterator] => InfiniteIterator [InvalidArgumentException] => InvalidArgumentException [IteratorIterator] => IteratorIterator [LengthException] => LengthException [LimitIterator] => LimitIterator [LogicException] => LogicException [MultipleIterator] => MultipleIterator [NoRewindIterator] => NoRewindIterator [OuterIterator] => OuterIterator [OutOfBoundsException] => OutOfBoundsException [OutOfRangeException] => OutOfRangeException [OverflowException] => OverflowException [ParentIterator] => ParentIterator [RangeException] => RangeException [RecursiveArrayIterator] => RecursiveArrayIterator [RecursiveCachingIterator] => RecursiveCachingIterator [RecursiveDirectoryIterator] => RecursiveDirectoryIterator [RecursiveFilterIterator] => RecursiveFilterIterator [RecursiveIterator] => RecursiveIterator [RecursiveIteratorIterator] => RecursiveIteratorIterator [RecursiveRegexIterator] => RecursiveRegexIterator [RecursiveTreeIterator] => RecursiveTreeIterator [RegexIterator] => RegexIterator [RuntimeException] => RuntimeException [SeekableIterator] => SeekableIterator [SplDoublyLinkedList] => SplDoublyLinkedList [SplFileInfo] => SplFileInfo [SplFileObject] => SplFileObject [SplFixedArray] => SplFixedArray [SplHeap] => SplHeap [SplMinHeap] => SplMinHeap [SplMaxHeap] => SplMaxHeap [SplObjectStorage] => SplObjectStorage [SplObserver] => SplObserver [SplPriorityQueue] => SplPriorityQueue [SplQueue] => SplQueue [SplStack] => SplStack [SplSubject] => SplSubject [SplTempFileObject] => SplTempFileObject [UnderflowException] => UnderflowException [UnexpectedValueException] => UnexpectedValueException )

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