Plus, PHP is so easy to learn and used everywhere that not knowing it is:
a bad reference on your curriculum,
like not knowing any shell or bash command. Sure, you can ignore those but it shows the moment you are assigned some simple tasks. Your boss will know. Your colleagues will know.
I really hope this was a joke.
There are plenty of devs that DON'T know PHP and never will and that has ZERO impact on their Software Development career.
Many devs stay way from PHP for good reasons. Even though we now have modern PHP with modern frameworks and practices their is still A LOT of legacy php applications. Even today I still sometimes get contracts where there are projects running php 5.6
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