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What is fexpr in php?

What is fexpr in PHP? As I have caught so far, this is a kind of function in the Lisp language:

In Lisp programming languages, fexpr is a function whose operands are passed to it without evaluation.

I read an article discussing PHP constructs, I came across fexpr, and Googling led me to think that this is basically the concept of Lisp!

That’s why I can’t clearly wrap my head. Could you explain what fexpr is in PHP? and (if it is semantically conceivable) Please provide an example and an example of use.

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Simply put - this is what allows the "functions", such as isset(), and empty()to take possible variables are undefined.

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Source: https://habr.com/ru/post/1686749/

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