20:16:43 Write to Excel2007 format<br />20:16:43 File written to 33chartcreate-multiple-charts.xlsx<br />20:16:43 Peak memory usage: 1.75 MB<br />20:16:43 Done writing file<br />File has been created in /var/www/yii2/vendor/phpoffice/phpexcel/Examples<br />