Question: HTML CSS PHP coding how do I do this? Proper PHP functions should be used to automatically show the last time each page was modified.

HTML CSS PHP coding

how do I do this?

Proper PHP functions should be used to automatically show the last time each page was modified. The date and file time functions are examples.

AND

I need more explanation on how to put and use a W3C Markup Validator on my website I am coding.

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