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<?php function find(array $arr, $someVar) { foreach ($arr as $key => $var) { // циклом проходимся по массиву if (is_array($var)) { // если итератор тоже массив, то рекурсивно вызывается функция find $k = find($var, $someVar); if ($k) return $k; } elseif ($var === $someVar) { return $key; } } return false; } var_dump(find(["a", ["b", 6, "z"=>"e"], "c", "b"], "e"));
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