What is the "correct" way to start and close a PHP statement?
<p>Is there any difference or associated risk opening with the following PHP variations?</p>

<pre><code>&lt;? echo "hello world!"; ?&gt;

&lt;?php echo "hello world!"; ?&gt;

&lt;?="hello world!"?&gt;
</code></pre>

<p>Also, is it necessary to close all scripts with <code>?&gt;</code></p>
