Comments

PHP supports 'C', 'C++' and Unix shell-style comments. For example:

 ?php
    echo "This is a test"; // This is a one-line c++ style comment
    /* This is a multi line comment
       yet another line of comment */
    echo "This is yet another test";
    echo "One Final Test"; # This is shell-style style comment
? 


The "one-line" comment styles actually only comment to the end of the line or the current block of PHP code, whichever comes first.

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

You should be careful not to nest 'C' style comments, which can happen when commenting out large blocks.

 ?php
 /* 
    echo "This is a test"; /* This comment will cause a problem */
 */
? 

The one-line comment styles actually only comment to the end of the line or the current block of PHP code, whichever comes first. This means that HTML code after // ? WILL be printed: ? skips out of the PHP mode and returns to HTML mode, and // cannot influence that.