### Rule <!--- Provide a high level explanation of the rule --> I saw a warning similar to this in my IDE the other day: ``` The use of function filectime() / filemtime() is discouraged. ``` It was not coming from Magento CS but from PHPCS which I am currently using WITH Magento 2 CS. If this check / warning is already there, would not be helpful to provide developers with some guidance or alternatives on what they can use instead? ### Reason <!--- Explain, why this rule improves code quality --> TBC: I am still doing some research to understand WHY the use of this is discouraged. I will complete this section with my findings. ### Implementation <!--- If possible: how to technically check the compliance to this rule --> [This guy](http://blog.tobiasforkel.de/en/2019/01/04/the-use-of-function-filectime-filemtime-is-discouraged-in-magento2/) proposes to use `\Magento\Framework\Filesystem\Driver\File`, same we are already advising to use to replace these kind of PHP functions.