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<?php $a = ['a'=>1,'b'=>2,'c'=>3]; var_dump(array_reduce($a, function($result, $item){ $key = key($result) == 'a' ? 'a' : 'aa'; $result[$key] = $item; return $result; }));
Output for git.master, git.master_jit, rfc.property-hooks
Fatal error: Uncaught TypeError: key(): Argument #1 ($array) must be of type array, null given in /in/rN3WP:5 Stack trace: #0 /in/rN3WP(5): key(NULL) #1 [internal function]: {closure}(NULL, 1) #2 /in/rN3WP(4): array_reduce(Array, Object(Closure)) #3 {main} thrown in /in/rN3WP on line 5
Process exited with code 255.

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