Quick and dirty query sting redirector

galleryRedirector.modx.plugin.php

/*
Quick plugin I just wrote to redirect querystring based uri's used in old site to new modx resource location. 
Not intended to be anything more then a quick fix until search engines are no longer indexing the old links. 
Might be useful in helping someone learn how to write a dynamic 301 redirect
*/

/* 
NOTE: For a more robust controller I would recommend you checkout http://modx.com/extras/package/simplxcontroller by larscwallin
*/

if(substr_count($_SERVER['REQUEST_URI'],'/gallery/gallery.php') > 0){
  if(!empty($_GET['id'])){

    $doc = $modx->getObject('modResource',array('alias'=>$_GET['id']));
    if($doc){
      $docId  = $doc->get('id');
      $target = $modx->makeUrl($docId);
      $target = $modx->getOption('site_url').$target;
      
      $modx->log(modX::LOG_LEVEL_INFO, 'Redirecting old gallery link to new');
      header('HTTP/1.1 301 Moved Permanently');
      $modx->sendRedirect($target);
    }
  }
}