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The preferred way to install this extension is through composer.

Either run

php composer.phar require "alexgx/yii2-phpexcel" "*"

or add

"alexgx/yii2-phpexcel" : "*"

to the require section of your application's composer.json file.

TDB

use alexgx\phpexcel;

TBD

Please, check the PHPOffice/PHPExcel github repo documentation for further information about its configuration options.