Question

i would like use a variable session ($_session) but it doesn’t work in Drupal 7. What are the possibilities in Drupal 7 in order to save variable session.

Answer 1

You can try this.

function lists_session($key, $value = NULL) {
  static $storage;
  if ($value) {
    $storage[$key] = $value ;
    $_SESSION['lists'][$key] = $value ;   // I use 'lists' in case some other module uses 'type' in $_SESSION
  }
  else if (empty($storage[$key]) && isset($_SESSION['lists'][$key])) {
    $storage[$key] = $_SESSION['lists'][$key];
  }
  return $storage[$key];
}

So, to save a variable in Session:

lists_session("s_key", "value");

And to retrieve the value, just use:

$myVar = lists_session("s_key");