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<?php $array = [1, 2, 3, 4]; $callable = function($value, $key, array $output) { $output[$key] = $value * 100; }; $output = []; array_map($callable, $array, array_keys($array), $output); print_r($output);
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
Fatal error: Uncaught TypeError: {closure}(): Argument #3 ($output) must be of type array, null given in /in/lA6ns:4 Stack trace: #0 [internal function]: {closure}(1, 0, NULL) #1 /in/lA6ns(9): array_map(Object(Closure), Array, Array, Array) #2 {main} thrown in /in/lA6ns on line 4
Process exited with code 255.
Output for 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33
Fatal error: Uncaught TypeError: Argument 3 passed to {closure}() must be of the type array, null given in /in/lA6ns:4 Stack trace: #0 [internal function]: {closure}(1, 0, NULL) #1 /in/lA6ns(9): array_map(Object(Closure), Array, Array, Array) #2 {main} thrown in /in/lA6ns on line 4
Process exited with code 255.
Output for 5.5.0 - 5.5.38, 5.6.0 - 5.6.40
Catchable fatal error: Argument 3 passed to {closure}() must be of the type array, null given in /in/lA6ns on line 4
Process exited with code 255.
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