03:01:02 Create new PHPExcel object
03:01:02 Set document properties
03:01:02 Add some data
03:01:02 Sum of Range #1 is 23
03:01:02 Sum of Range #2 is 33
03:01:02 Sum of both Ranges is 56
03:01:02 Minimum value in either Range is 3
03:01:02 Maximum value in either Range is 17
03:01:02 Average value of both Ranges is 9.3333333333333
03:01:02 Rename worksheet
03:01:02 Write to Excel2007 format

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Fatal error: Uncaught exception 'PHPExcel_Writer_Exception' with message 'Could not close zip file /opt/lampp/htdocs/vendor/phpoffice/phpexcel/Examples/03formulas.xlsx.' in /opt/lampp/htdocs/vendor/phpoffice/phpexcel/Classes/PHPExcel/Writer/Excel2007.php:389 Stack trace: #0 /opt/lampp/htdocs/vendor/phpoffice/phpexcel/Examples/03formulas.php(119): PHPExcel_Writer_Excel2007->save('/opt/lampp/htdo...') #1 {main} thrown in /opt/lampp/htdocs/vendor/phpoffice/phpexcel/Classes/PHPExcel/Writer/Excel2007.php on line 389