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<?php $map = array(array('-1'=>0, '-10'=>0, '-100'=>0), array(array('-1'=>0, '-10'=>0, '-100'=>0))); array_walk_recursive($map, function($item, $key, $whatever){var_dump($item, $key, $whatever);if(is_array($item))ksort($item);}); print_r($map);
Output for git.master, git.master_jit, rfc.property-hooks
Fatal error: Uncaught ArgumentCountError: Too few arguments to function {closure}(), 2 passed and exactly 3 expected in /in/prXs0:4 Stack trace: #0 [internal function]: {closure}(0, -1) #1 /in/prXs0(4): array_walk_recursive(Array, Object(Closure)) #2 {main} thrown in /in/prXs0 on line 4
Process exited with code 255.

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