7.x DatabaseHandler.php	DatabaseHandler::request_new_advising_session_token()
6.x DatabaseHandler.php	DatabaseHandler::request_new_advising_session_token()

Generates a new advising session token and makes sure it is unique before returning it.

File

classes/DatabaseHandler.php, line 383

Class

DatabaseHandler

Code

function request_new_advising_session_token() {

  for ($t = 0; $t < 1000; $t++) { // try up to 1000 times

    $test_token = hash('sha256', mt_rand(0, 99999) . microtime() . mt_rand(0, 99999));

    // check for collisions
    $res = $this->db_query("SELECT advising_session_id 
                              FROM advising_sessions 
                              WHERE advising_session_token = ?", array($test_token));
    if ($this->db_num_rows($res) == 0) {
      // Was not in the table, so we can use it.
      return $test_token;
    }
  }

  return FALSE; // some kind of problem-- we never found an available token!

}