21:36:29 Write to Excel2007 format<br />21:36:29 File written to 33chartcreate-multiple-charts.xlsx<br />21:36:29 Peak memory usage: 6 MB<br />21:36:29 Done writing file<br />File has been created in /var/www/customs_rongma/vendor/phpoffice/phpexcel/Examples<br />