title: why a file php will be downloaded after each calling with argument
body: <p>when the link <a href="http://127.0.0.1:8080/example.php?id=38" rel="nofollow noreferrer">http://127.0.0.1:8080/example.php?id=38</a> will be executed I can't see the content of this page php... chrome will download this file !!</p>
  
  <p><div class="snippet" data-lang="js" data-hide="false" data-console="true" data-babel="false">
  <div class="snippet-code">
  <pre class="snippet-code-html lang-html prettyprint-override"><code>&lt;!DOCTYPE html&gt;
  &lt;html&gt;
      &lt;head&gt;
          &lt;meta charset="UTF-8"&gt;
          &lt;title&gt;test&lt;/title&gt;
         
          &lt;script src="public/jquery-1.11.2.min.js" type="text/javascript"&gt;&lt;/script&gt;
      &lt;/head&gt;
  
      &lt;body&gt;
      &lt;?php
       // check the input
              //is_numeric($_GET['id']) or die("invalid URL");
             
    ?&gt;
      &lt;/body&gt;
      &lt;script type="text/javascript"&gt;
       console.log(&lt;?php $_GET['id'] ?&gt;);
      &lt;/script&gt;
      &lt;/html&gt;</code></pre>
  </div>
  </div>
  </p>