C:/xampp/htdocs/moodle/enrol/meta/db/uninstall.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/>.

defined('MOODLE_INTERNAL') || die();

function xmldb_enrol_meta_uninstall() {
    global $CFG, $DB;

    $meta = enrol_get_plugin('meta');
    $rs = $DB->get_recordset('enrol', array('enrol'=>'meta'));
    foreach ($rs as $instance) {
        $meta->delete_instance($instance);
    }
    $rs->close();

    role_unassign_all(array('component'=>'enrol_meta'));

    return true;
}