how to recoganize commented code php code example

Example 1: comment in php

<h1>This is an <?php # echo 'simple';?> example</h1>
<p>The header above will say 'This is an  example'.</p>

Example 2: comment in php

MSpreij (8-May-2005) says  /* .. */ overrides //  
Anonymous (26-Jan-2006) says // overrides /* .. */

Actually, both are correct. Once a comment is opened, *everything* is ignored until the end of the comment (or the end of the php block) is reached.

Thus, if a comment is opened with: 
   //  then /* and */ are "overridden" until after end-of-line 
   /*  then // is "overridden" until after */