<function name="rpcf_get_user_by_account" id="0x2026">
      <input>
        <integer name="account_id"/>
      </input>
      <output>
        <integer name="user_id"/>
        <if variable="user_id" value="0" condition="eq">
          <error code="19" comment="No such account linked with user"/>
        </if>
      </output>
    </function>

	// return user_id or 0 if user not found
	function rpcf_get_user_by_account($account_id) { //0x2026
		$ret=array();
		if (!$this->connection->urfa_call(0x2026)) {
			print "Error calling function ". __FUNCTION__ ."\n";
			return FALSE;
		}
		$packet = $this->connection->getPacket();
		$packet->DataSetInt($account_id);
		$this->connection->urfa_send_param($packet);
		if ($x = $this->connection->urfa_get_data()) {
			$user_id = $x->DataGetInt();
		}
//		$this->connection->urfa_get_data();
		return $user_id;
	}