title: How to add url parameter to the current url?
body: <p>Currently I'm at </p>
  
  <pre><code>http://example.com/topic.php?id=14 
  </code></pre>
  
  <p>and I want to make a link to </p>
  
  <pre><code>http://example.com/topic.php?id=14&amp;like=like 
  </code></pre>
  
  <p>by not defining the current url. Like <code>&lt;a href="&amp;like=like"&gt;Like&lt;/a&gt;</code>. However this last one shows me <code>http://example.com/&amp;like=like</code></p>