Boardunity & Video Forum - MediaWiki Links anonymisieren

1. Upload the file to your wiki's /extensions directory
2. Add require_once("$IP/extensions/Dereferer.php"); near the end of
your LocalSettings.php file
3. Visit Special:Version on your wiki to verify the installation (it
should show up in the "Other" section)

File: Dereferer.php

PHP-Code:

   <?php

if(!defined('MEDIAWIKI')) {
    echo 'This is an extension to the MediaWiki software and cannot be used standalone.';
    die(1);
}

$wgExtensionCredits['other'][] = array(
    'name'           => 'Dereferer',
    'description'    => 'Removes referer from links by redirecting all of them through dereferer.org',
    'author'         => '<span class="plainlinks">[http://www.mediawiki.org/wiki/User:Skizzerz Ryan Schmidt]</span>',
    'version'        => '1.0'
);

$wgHooks['LinkerMakeExternalLink'][] = 'efDereferer';

function efDereferer(&$url, &$text, &$link) {
    //don't derefer a link already pointing to dereferer.org :)
    if(!preg_match('!^http://(www\.)?dereferer\.org/?!', $url)) {
        $url = 'http://www.dereferer.org/?' . $url;
    }
    return true; //we only need to return false if we want to modify the HTML of the link. Simply modifying the url can let us return true.
}