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<?php $array = [ '1' => true, ['2' => false, '4' => true], '3' => true ]; function findKeysWithTrueValues(array $array): array { $matches = []; foreach ($array as $key => $value) { if (is_array($value)) { foreach (findKeysWithTrueValues($value) as $match) { $matches[] = $match; } } elseif ($value === true) { $matches[] = $key; } } return $matches; } print_r(findKeysWithTrueValues($array));
Output for git.master, git.master_jit, rfc.property-hooks
Array ( [0] => 1 [1] => 4 [2] => 3 )

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