title: filter_var(): is this a valid URL?
body: <p>I have the following:</p>
  
  <pre><code>$url= "http://t";
  
  if (filter_var($url, FILTER_VALIDATE_URL) === FALSE) {
      echo "FALSE";
  } else {
      echo "TRUE";
  }
  </code></pre>
  
  <p>This is returning true, when it's not a valid website. Why?</p>