note 107786 deleted from function.array-key-exists by crell

Note Submitter: Nik Tang ---- If you want to take the performance advantage of isset() while keeping the NULL element correctly detected, use this: if (isset(..) || array_key_exists(...)) { ... } Benchmark (100000 runs): array_key_exists() : 205 ms is_set() : 35ms isset() || array_key_exists() : 48ms Note: The code for this check is very fast, so you shouldn't warp the code into a single function like below, because the overhead of calling a function dominates the overall performance. function array_check(...) { return (isset(..) || array_key_exists(...)) }