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<?php namespace A; function identity($i) { return $i; } namespace B; use function A\identity; var_dump(array_map(identity::class, [1, 2]));
Output for git.master, git.master_jit, rfc.property-hooks
Fatal error: Uncaught TypeError: array_map(): Argument #1 ($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.

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