C:/xampp/htdocs/moodle/webservice/rest/lib.php

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<?php

// This file is part of Moodle - http://moodle.org/
//
// Moodle is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// Moodle is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with Moodle.  If not, see <http://www.gnu.org/licenses/>.

class webservice_rest_client {

    private $serverurl;

    private $token;
    private $format;

    public function __construct($serverurl, $token, $format = 'xml') {
        $this->serverurl = new moodle_url($serverurl);
        $this->token = $token;
        $this->format = $format;
    }

    public function set_token($token) {
        $this->token = $token;
    }

    public function call($functionname, $params) {
        global $DB, $CFG;

         if ($this->format == 'json') {
             $formatparam = '&moodlewsrestformat=json';
             $this->serverurl->param('moodlewsrestformat','json');
         } else {
             $formatparam = ''; //to keep retro compability with old server that only support xml (they don't expect this param)
         }

        $this->serverurl->param('wstoken',$this->token);
        $this->serverurl->param('wsfunction',$functionname); //you could also use params().

        $result = download_file_content($this->serverurl->out(false), null, $params);

        //TODO : transform the XML result into PHP values - MDL-22965
        if ($this->format == 'json') {
            $result = json_decode($result);
        }

        return $result;
    }

}