Manual do PHP Referência das Funções Outras Extensões Básicas SPL Interfaces RegexIterator::setPregFlags Countable Interfaces Table of ContentsCountableOuterIteratorRecursiveIteratorSeekableIterator SPL provides a set of interfaces.See also the Predefined Interfaces and Classes Interface list Countable OuterIterator RecursiveIterator SeekableIterator SplObserver SplSubject