splstack.inc

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<?php

class SplStack extends SplDoublyLinkedList
{
    protected $_it_mode = parent::IT_MODE_LIFO;

    public function setIteratorMode($mode)
    {
        if ($mode & parent::IT_MODE_LIFO !== parent::IT_MODE_LIFO) {
            throw new RuntimeException("Iterators' LIFO/FIFO modes for SplStack/SplQueue objects are frozen");
        }

        $this->_it_mode = $mode;
    }
}

?>