grobolom

  ArrayHelpers::array_select_keys();

  array_select_keys();

  $array = ['a' => 1, 'b' => 2, 'c' => 3, 'd' => 4];

  array_select_keys($array, ['a', 'b']);
  array_intersect_key($array, ['a' => '', 'b' => '']); // OR
  array_intersect_key($array, array_flip(['a', 'b'])); // OR

  function array_select_keys(array $dict, array $keys)
  {
      $result = array();
      foreach ($keys as $key) {
          if (array_key_exists($key, $dict)) {
              $result[$key] = $dict[$key];
          }
      }
      return $result;
  }