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<?php function isNumberPresentInArray($a, $b) { foreach($a as $v) { if (is_array($v)) { if (isNumberPresentInArray($v, $b)) { return true; } } elseif ($v == $b) { return true; } } return false; } $a = [1, 2, [3, 4, 5], [6, [7, 8], 8, 10]]; var_dump(isNumberPresentInArray($a, 10)); // bool(true); var_dump(isNumberPresentInArray($a, 2)); // bool(true); var_dump(isNumberPresentInArray($a, 14)); // bool(false); var_dump(isNumberPresentInArray($a, 1)); // bool(true);