15: How to check if an element is in a PHP array - PHP 7 Tutorial

How would you change if a value is in a PHP array - Learn PHP Array Programming. Today's tutorial is demonstration of the in_array function

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Thx, very detailed.
I found your video because I was looking for a solution which is able to do something like this:

pseudo code:
if valueOfInput(s) is inArray, return all found keys

I have a solution, but it's not satisfying. I have to flatten the Array first and afterwards I have to compare it line by line. Is there no more direct solution for this?