Lester Caine wrote on 16/09/2015 11:35:
If you are working with an array then fine, but we are talking about variables here not arrays. isset($i) is a local variable so 'which array is the variable is hiding in' applies?
No, it's not hiding in any array, and I agree that array_key_exists() is not the right function to use.
However, I have still yet to see any use case where it would be necessary or useful to detect - at runtime, rather than in static analysis for debugging - that $i has never been initialised, vs it having been initialised to null.
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