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<?php $array = [1, 2, 3, 4]; $callable = function(&$value, $key) { $value = $value * 100; echo $key.PHP_EOL; }; $newArray = array_map($callable, $array); print_r($newArray);
Output for git.master, git.master_jit, rfc.property-hooks
Warning: {closure}(): Argument #1 ($value) must be passed by reference, value given in /in/PlKcr on line 9 Fatal error: Uncaught ArgumentCountError: Too few arguments to function {closure}(), 1 passed and exactly 2 expected in /in/PlKcr:4 Stack trace: #0 [internal function]: {closure}(1) #1 /in/PlKcr(9): array_map(Object(Closure), Array) #2 {main} thrown in /in/PlKcr on line 4
Process exited with code 255.

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