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<?php $arr = [ 'A', 'B', 'C', 'D' => [ 'E', 'F' => [ 'G', 'H' ] ], 'I' => [ 'J', 'K' ], 'L' ]; function categoryExist($arr, $category) : bool { $ce = false; foreach ($arr as $key => $value) { if ($category === $key) return true; if (is_array($value)) { if (categoryExist($value, $category)) return true; } else { if ($category === $value) return true; } } return false; } foreach (range('A', 'M') as $cat) echo "Category '$cat' " . (categoryExist($arr, $cat) ? '' : 'not ') . "found\n"; ?>
Output for git.master, git.master_jit, rfc.property-hooks
Category 'A' found Category 'B' found Category 'C' found Category 'D' found Category 'E' found Category 'F' found Category 'G' found Category 'H' found Category 'I' found Category 'J' found Category 'K' found Category 'L' found Category 'M' not found

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