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<?php $array = [ 1 => [ 1 => [ 'anna', 'alice' ], 2 => [ 'bob', 'bartold' ] ], 2 => [ 1 => [ 'carol' ], 2 => [ 'david' ] ] ]; $result = []; $prevKey = 0; array_walk_recursive($array, function ($value, $key, $prevKey) use (&$result) { $prevKey = $key; if (!is_array($value)) { echo "{$prevKey} <br /> -- {$value} <br />"; } }); var_dump($result);
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/kKmVZ:26 Stack trace: #0 [internal function]: {closure}('anna', 0) #1 /in/kKmVZ(26): array_walk_recursive(Array, Object(Closure)) #2 {main} thrown in /in/kKmVZ on line 26
Process exited with code 255.

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