title: PHP Multilanguage GET parameters
body: <p>I'm building multi-language support for PHP page. Let's say I have a page url:</p>
  <pre><code>http://mypage.php?user=eric&amp;city=newyork
  </code></pre>
  <p>What is the common solution to switch between get parameters <strong>lang=en</strong> and <strong>lang=es</strong> while keeping the get parameters already in the url?</p>