CyclicReferenceStack.php

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<?php
class PHPExcel_CalcEngine_CyclicReferenceStack {

        private $_stack = array();


        public function count() {
                return count($this->_stack);
        }

        public function push($value) {
                $this->_stack[$value] = $value;
        }

        public function pop() {
                return array_pop($this->_stack);
        }

        public function onStack($value) {
                return isset($this->_stack[$value]);
        }

        public function clear() {
                $this->_stack = array();
        }

        public function showStack() {
                return $this->_stack;
        }

}