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Edit File: 13calculationCyclicFormulae.php

<?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] == '=')) {
            echo 'Value of ' , $col , $row , ' [' , $formula , ']: ' ,
                               $objPHPExcel->getActiveSheet()->getCell($col.$row)->getCalculatedValue() . EOL;
        }
    }
}

// Save Excel 2007 file
echo date('H:i:s') , " Write to Excel2007 format" , EOL;
$callStartTime = microtime(true);

$objWriter = PHPExcel_IOFactory::createWriter($objPHPExcel, 'Excel2007');

//
//  If we set Pre Calculated Formulas to true then PHPExcel will calculate all formulae in the
//    workbook before saving. This adds time and memory overhead, and can cause some problems with formulae
//    using functions or features (such as array formulae) that aren't yet supported by the calculation engine
//  If the value is false (the default) for the Excel2007 Writer, then MS Excel (or the application used to
//    open the file) will need to recalculate values itself to guarantee that the correct results are available.
//
//$objWriter->setPreCalculateFormulas(true);
$objWriter->save(str_replace('.php', '.xlsx', __FILE__));
$callEndTime = microtime(true);
$callTime = $callEndTime - $callStartTime;

echo date('H:i:s') , " File written to " , str_replace('.php', '.xlsx', pathinfo(__FILE__, PATHINFO_BASENAME)) , EOL;
echo 'Call time to write Workbook was ' , sprintf('%.4f',$callTime) , " seconds" , EOL;
// Echo memory usage
echo date('H:i:s') , ' Current memory usage: ' , (memory_get_usage(true) / 1024 / 1024) , " MB" , EOL;

// Echo memory peak usage
echo date('H:i:s') , " Peak memory usage: " , (memory_get_peak_usage(true) / 1024 / 1024) , " MB" , EOL;

// Echo done
echo date('H:i:s') , " Done writing file" , EOL;
echo 'File has been created in ' , getcwd() , EOL;