Robuta

https://www.php.net/manual/it/filters.compression.php
phpcompressionfiltersmanual
https://www.yiiframework.com/doc/guide/2.0/en/structure-filters
definitive guideapplicationstructurefiltersyii
https://www.yiiframework.com/doc/api/2.0/yii-filters-auth-authinterface
api documentationyiifiltersauth
https://code.tutsplus.com/sanitize-and-validate-data-with-php-filters--net-2595t
Data validation is an integral part of working with forms. Not only can invalid submitted data lead to security problems, but it can also break your webpage....
validate dataphp filterssanitizeenvatotuts
https://www.php.net/manual/it/filters.convert.php
phpconversionfiltersmanual