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I'm aware of the benchmarks for isset() vs empty(), but I have code I need to execute only when the argument is null. This is in a function that executes many times so I'd like to optimize it.
I know that isset() is faster than empty(), but what about !isset() vs. === null? I know that the variable will exist, so I only need to test it against null.
I'm thinking of the possible penalty for the ! operator.
872
The isset() function is an inbuilt function in PHP which checks whether a variable is set and is not NULL. This function also checks if a declared variable, array or array key has null value, if it does, isset() returns false, it returns true in all other possible cases.
The isset() function is an inbuilt function in PHP that is used to determine if the variable is declared and its value is not equal to NULL. The empty() function is an inbuilt function in PHP that is used to check whether a variable is empty or not.
The equivalent of isset($var) for a function return value is func() === null .
I felt lazy asking someone else to benchmark this, so I tried a million iterations.
The difference is trivial, so !isset() is a better option since === null would throw an error if the variable was ever undefined.
One Million iterations:
!isset() .1118
=== null .1046
BTW, there is an (also trivial) penalty for the ! operator.
isset() .1118
!isset() .1203
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