mall/librarys/phpexcel/PHPExcel/CalcEngine/CyclicReferenceStack.php

<?php
/**
 * 重庆赤晓店信息科技有限公司
 * https://www.chixiaodian.com
 * Copyright (c) 2023 赤店商城 All rights reserved.
 */
class PHPExcel_CalcEngine_CyclicReferenceStack
{
    /**
     *  The call stack for calculated cells
     *
     *  @var mixed[]
     */
    private $stack = array();

    /**
     * Return the number of entries on the stack
     *
     * @return  integer
     */
    public function count()
    {
        return count($this->stack);
    }

    /**
     * Push a new entry onto the stack
     *
     * @param  mixed  $value
     */
    public function push($value)
    {
        $this->stack[$value] = $value;
    }

    /**
     * Pop the last entry from the stack
     *
     * @return  mixed
     */
    public function pop()
    {
        return array_pop($this->stack);
    }

    /**
     * Test to see if a specified entry exists on the stack
     *
     * @param  mixed  $value  The value to test
     */
    public function onStack($value)
    {
        return isset($this->stack[$value]);
    }

    /**
     * Clear the stack
     */
    public function clear()
    {
        $this->stack = array();
    }

    /**
     * Return an array of all entries on the stack
     *
     * @return  mixed[]
     */
    public function showStack()
    {
        return $this->stack;
    }
}