title: Difference between <?php and <?
body: <p>I am new to php and would like to know if there are any differences between these server tags :</p>
  
  <pre><code>&lt;?php
  ?&gt;
  </code></pre>
  
  <p>and </p>
  
  <pre><code>&lt;?
  ?&gt;
  </code></pre>