C:/xampp/htdocs/moodle/user/filters/globalrole.php

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<?php

require_once($CFG->dirroot.'/user/filters/lib.php');

class user_filter_globalrole extends user_filter_type {

    function user_filter_globalrole($name, $label, $advanced) {
        parent::user_filter_type($name, $label, $advanced);
    }

    function get_roles() {
        $context = get_context_instance(CONTEXT_SYSTEM);
        $roles = array(0=> get_string('anyrole','filters')) + get_assignable_roles($context);
        return $roles;
    }

    function setupForm(&$mform) {
        $obj =& $mform->addElement('select', $this->_name, $this->_label, $this->get_roles());
        $mform->setDefault($this->_name, 0);
        if ($this->_advanced) {
            $mform->setAdvanced($this->_name);
        }
    }

    function check_data($formdata) {
        $field = $this->_name;

        if (array_key_exists($field, $formdata) and !empty($formdata->$field)) {
            return array('value' => (int)$formdata->$field);
        }
        return false;
    }

    function get_sql_filter($data) {
        global $CFG;
        $value = (int)$data['value'];

        $timenow = round(time(), 100);

        $sql = "id IN (SELECT userid
                         FROM {role_assignments} a
                        WHERE a.contextid=".SYSCONTEXTID." AND a.roleid=$value)";
        return array($sql, array());
    }

    function get_label($data) {
        global $DB;

        $rolename = $DB->get_field('role', 'name', array('id'=>$data['value']));

        $a = new stdClass();
        $a->label = $this->_label;
        $a->value = '"'.format_string($rolename).'"';

        return get_string('globalrolelabel', 'filters', $a);
    }
}