vendor/phpoffice/phpexcel/Examples/13calculationCyclicFormulae.php

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<?php
/**
 * PHPExcel
 *
 * Copyright (C) 2006 - 2014 PHPExcel
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 *
 * @category   PHPExcel
 * @package    PHPExcel
 * @copyright  Copyright (c) 2006 - 2014 PHPExcel (http://www.codeplex.com/PHPExcel)
 * @license    http://www.gnu.org/licenses/old-licenses/lgpl-2.1.txt	LGPL
 * @version    ##VERSION##, ##DATE##
 */

/** Error reporting */
error_reporting(E_ALL);
ini_set('display_errors', TRUE);
ini_set('display_startup_errors', TRUE);
date_default_timezone_set('Europe/London');

define('EOL',(PHP_SAPI == 'cli') ? PHP_EOL : '<br />');

date_default_timezone_set('Europe/London');

/** Include PHPExcel */
require_once dirname(__FILE__) . '/../Classes/PHPExcel.php';


// Create new PHPExcel object
echo date('H:i:s') , " Create new PHPExcel object" , EOL;
$objPHPExcel = new PHPExcel();

// Add some data, we will use some formulas here
echo date('H:i:s') , " Add some data and formulas" , EOL;
$objPHPExcel->getActiveSheet()->setCellValue('A1', '=B1')
                              ->setCellValue('A2', '=B2+1')
                              ->setCellValue('B1', '=A1+1')
                              ->setCellValue('B2', '=A2');

PHPExcel_Calculation::getInstance($objPHPExcel)->cyclicFormulaCount = 100;

// Calculated data
echo date('H:i:s') , " Calculated data" , EOL;
for($row = 1; $row <= 2; ++$row) {
    for ($col = 'A'; $col != 'C'; ++$col) {
        if ((!is_null($formula = $objPHPExcel->getActiveSheet()->getCell($col.$row)->getValue())) &&
			($formula[0] == '=')) {