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<?php namespace A; function identity($i) { return $i; } namespace B; use function A\identity; var_dump(array_map(identity::class, [1, 2]));
Output for 8.1.0 - 8.1.34, 8.2.0 - 8.2.31, 8.3.0 - 8.3.31, 8.4.1 - 8.4.22, 8.5.0 - 8.5.7
Fatal error: Uncaught TypeError: array_map(): Argument #1 ($callback) must be a valid callback or null, function "B\identity" not found or invalid function name in /in/Z8eMP:8 Stack trace: #0 /in/Z8eMP(8): array_map('B\\identity', Array) #1 {main} thrown in /in/Z8eMP on line 8
Process exited with code 255.
Output for 8.0.0 - 8.0.30
Fatal error: Uncaught TypeError: array_map(): Argument #1 ($callback) must be a valid callback, function "B\identity" not found or invalid function name in /in/Z8eMP:8 Stack trace: #0 /in/Z8eMP(8): array_map('B\\identity', Array) #1 {main} thrown in /in/Z8eMP on line 8
Process exited with code 255.
Output for 7.2.0 - 7.2.34, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33
Warning: array_map() expects parameter 1 to be a valid callback, function 'B\identity' not found or invalid function name in /in/Z8eMP on line 8 NULL

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