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<?php $a = ['asdf','foo','bar']; $f = array_map($a, 'strtoupper'); var_dump($f);
Output for git.master, git.master_jit, rfc.property-hooks
Fatal error: Uncaught TypeError: array_map(): Argument #1 ($callback) must be a valid callback or null, array callback must have exactly two members in /in/eNq0Q:4 Stack trace: #0 /in/eNq0Q(4): array_map(Array, 'strtoupper') #1 {main} thrown in /in/eNq0Q on line 4
Process exited with code 255.

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