class.ilDclStack.php

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<?php

class ilDclStack {

        protected $stack = array();


        public function push($elem) {
                $this->stack[] = $elem;
        }


        public function pop() {
                if (!$this->isEmpty()) {
                        $last_index = count($this->stack) - 1;
                        $elem = $this->stack[$last_index];
                        unset($this->stack[$last_index]);
                        $this->stack = array_values($this->stack); // re-index
                        return $elem;
                }

                return NULL;
        }


        public function top() {
                if (!$this->isEmpty()) {
                        return $this->stack[count($this->stack) - 1];
                }

                return NULL;
        }


        public function isEmpty() {
                return !(bool)count($this->stack);
        }


        public function reset() {
                $this->stack = array();
        }


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


        public function debug() {
                echo "<pre>" . print_r($this->stack, 1) . "</pre>";
        }
}

?>