C:/xampp/htdocs/moodle/admin/tool/xmldb/actions/move_updown_index/move_updown_index.class.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 move_updown_index extends XMLDBAction {

    function init() {
        parent::init();

        // Set own custom attributes

        // Get needed strings
        $this->loadStrings(array(
            // 'key' => 'module',
        ));
    }

    function invoke() {
        parent::invoke();

        $result = true;

        // Set own core attributes
        $this->does_generate = ACTION_NONE;
        //$this->does_generate = ACTION_GENERATE_HTML;

        // These are always here
        global $CFG, $XMLDB;

        // Do the job, setting result as needed
        // Get the dir containing the file
        $dirpath = required_param('dir', PARAM_PATH);
        $dirpath = $CFG->dirroot . $dirpath;

        // Get the correct dirs
        if (!empty($XMLDB->dbdirs)) {
            $dbdir =& $XMLDB->dbdirs[$dirpath];
        } else {
            return false;
        }
        if (!empty($XMLDB->editeddirs)) {
            $editeddir =& $XMLDB->editeddirs[$dirpath];
            $structure =& $editeddir->xml_file->getStructure();
        }

        $prev = NULL;
        $next = NULL;
        $tableparam = required_param('table', PARAM_CLEAN);
        $indexparam = required_param('index', PARAM_CLEAN);
        $direction  = required_param('direction', PARAM_ALPHA);
        $tables =& $structure->getTables();
        $table =& $structure->getTable($tableparam);
        $indexes =& $table->getIndexes();
        if ($direction == 'down') {
            $index =& $table->getIndex($indexparam);
            $swap  =& $table->getIndex($index->getNext());
        } else {
            $swap  =& $table->getIndex($indexparam);
            $index =& $table->getIndex($swap->getPrevious());
        }

        // Change the index before the pair
        if ($index->getPrevious()) {
            $prev =& $table->getIndex($index->getPrevious());
            $prev->setNext($swap->getName());
            $swap->setPrevious($prev->getName());
            $prev->setChanged(true);
        } else {
            $swap->setPrevious(NULL);
        }
        // Change the field after the pair
        if ($swap->getNext()) {
            $next =& $table->getIndex($swap->getNext());
            $next->setPrevious($index->getName());
            $index->setNext($next->getName());
            $next->setChanged(true);
        } else {
            $index->setNext(NULL);
        }
        // Swap the indexes
        $index->setPrevious($swap->getName());
        $swap->setNext($index->getName());

        // Mark indexes as changed
        $index->setChanged(true);
        $swap->setChanged(true);

        // Table has changed
        $table->setChanged(true);

        // Reorder the indexes
        $table->orderIndexes($indexes);

        // Recalculate the hash
        $structure->calculateHash(true);

        // If the hash has changed from the original one, change the version
        // and mark the structure as changed
        $origstructure =& $dbdir->xml_file->getStructure();
        if ($structure->getHash() != $origstructure->getHash()) {
            $structure->setVersion(userdate(time(), '%Y%m%d', 99, false));
            $structure->setChanged(true);
        }

        // Launch postaction if exists (leave this here!)
        if ($this->getPostAction() && $result) {
            return $this->launch($this->getPostAction());
        }

        // Return ok if arrived here
        return $result;
    }
}