These are attributes which add metadata that can be programatically acessed by applications and tooling. That piece of code is about data validation. See more

These are attributes which add metadata that can be programatically acessed by applications and tooling. That piece of code is about data validation. See more at https://www.php.net/manual/en/language.attributes.overview.php https://www.php.net/manual/en/language.attributes.overview.p...