Thread:Project:Support desk/PHP version error when upgrading from 1.17 to 1.21/reply (15)

Hi!

Creating a full backup (files and databases) always must be the first step.

Then I would not install a new and empty 1.17 on the server, but I would do this: Move all the MediaWiki files and basically everything you have in the web root (if there is anything else) to the new server. Also export the database (mysqldump) and import it on the new server. Before running MediaWiki make sure that database collations are OK: They should not be different from those on the old server. Then adjust the MySQL user data in LocalSettings.php, clear all caches and see, what you get.

When that is working you can again make a backup and do the upgrade to 1.21.