Extensions (such as the hieroglyphic module WikiHiero) are distributed
separately. Drop them into this extensions directory and enable as
per the extension's directions.
If you are a developer, you want to fetch the extension tree in another
directory and make a symbolic link:
mediawiki/extensions$ ln -s ../../extensions-trunk/FooBarExt
The extensions are available through Git:
https://gerrit.wikimedia.org/r/#/admin/projects/
or Subversion:
https://svn.wikimedia.org/svnroot/mediawiki/trunk/extensions/
You can find documentation and additional extensions on MediaWiki website:
https://www.mediawiki.org/wiki/Category:Extensions
Please note that under POSIX systems (Linux...), parent of a symbolic path
refers to the link source, NOT to the target! You should check the env
variable MW_INSTALL_PATH in case the extension is not in the default location.
The following code snippet lets you override the default path:
$IP = getenv( 'MW_INSTALL_PATH' );
if( $IP === false ) {
$IP = __DIR__ . '/../..';
}
require_once( "$IP/maintenance/Maintenance.php" ); // a MediaWiki core file
