salaros / vtwsclib-php

     */

    public function invokeOperation($operation, array $params = null, $method = 'POST')

    {

        if (!empty($params) || !is_array($params) || !$this->isAssocArray($params)) {

            $this->lastErrorMessage = new WSClientError(

                "You have to specified a list of operation parameters, 

                but apparently it's not an associative array ('prop' => value), you must fix it!"

            );

            return false;

        }

        // Perform re-login if required

        $this->checkLogin();

     */

    private function checkParams(array $params, $paramsPurpose)

    {

        if (empty($params) || !is_array($params) || !$this->isAssocArray($params)) {

            $this->lastErrorMessage = new WSClientError(sprintf(

                "You have to specify at least one search parameter (prop => value) in order to %s",

                $paramsPurpose

            ));

            return false;

        }

        return true;

    }