PHP - Comments: While in PHP mode, you can mark certain parts of your code as a comment that should not be executed. There are three ways of doing this: //, /* */, and #. // and # mean "Ignore the rest of this line," whereas /* means "Ignore everything until you see */." Some complications exist with /* and */ that make them less desirable to use.

 <?php







print "This is printed\n";







// print "This is not printed\n";







# print "This is not printed\n";







print "This is printed\n";







/* print "This is not printed\n";







print "This is not printed\n"; */







?>

That chunk of code shows all three types of comments in action, but does not demonstrate the problem with the /* */ form of commenting. If you were to start a /* comment on line one, and end it on the line near the bottom where the other /* comment is started, you would find that the script would fail to work. The reason for this is that you cannot stack up, or "nest," /* */ comments, and attempting to do so will fail spectacularly.

It is generally best to stick to // for your commenting purposes, simply because it is easy to spot, easy to read, and easy to control.

Read More PHP:PHP - Functions | PHP - Including Other Files | PHP - Comments Tutorial | PHP - Example Whitespace | PHP - Variables of PHP | PHP - Basics of PHP | PHP Abnormal Script | PHP - Output Control 

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