LinkTitles.php

<?php
if ( function_exists( 'wfLoadExtension' ) ) {
  wfLoadExtension( 'LinkTitles' );
  // Keep i18n globals so mergeMessageFileList.php doesn't break
  $wgMessagesDirs['LinkTitles'] = __DIR__ . '/i18n';
  $wgExtensionMessagesFiles['LinkTitlesMagic'] = __DIR__ . '/includes/LinkTitles_Magic.php';
  wfWarn(
    'Deprecated PHP entry point used for LinkTitles extension. ' .
    'Please use wfLoadExtension instead, ' .
    'see https://www.mediawiki.org/wiki/Extension_registration for more details.'
  );
  return;
} else {
  die( 'This version of the LinkTitles extension requires MediaWiki 1.25+' );
}