14:43:10 Create new PHPExcel object
14:43:10 Add some data and formulas
14:43:10 Calculated data
Value of A1 [=B1]: 100
Value of B1 [=A1+1]: 100
Value of A2 [=B2+1]: 100
Value of B2 [=A2]: 99
14:43:10 Write to Excel2007 format

Fatal error: Uncaught Error: Class 'ZipArchive' not found in /var/www/html/planc/vendor/phpoffice/phpexcel/Classes/PHPExcel/Writer/Excel2007.php:220 Stack trace: #0 /var/www/html/planc/vendor/phpoffice/phpexcel/Examples/13calculationCyclicFormulae.php(82): PHPExcel_Writer_Excel2007->save('/var/www/html/p...') #1 {main} thrown in /var/www/html/planc/vendor/phpoffice/phpexcel/Classes/PHPExcel/Writer/Excel2007.php on line 220