Doctrine\DBAL\Connection::ping PHP Method

    public function ping()
    {
        $this->connect();
        if ($this->_conn instanceof PingableConnection) {
            return $this->_conn->ping();
        }
        try {
            $this->query($this->getDatabasePlatform()->getDummySelectSQL());
            return true;
        } catch (DBALException $e) {
            return false;
        }
    }

 /**
  * @return Connection
  */
 public function getConnection()
 {
     if (false === $this->connection->ping()) {
         $this->connection->close();
         $this->connection->connect();
     }
     return $this->connection;
 }