<?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 a one-line shell-style comment ?>
The "one-line" comment styles only comment to the end of the line or the current block of PHP code, whichever comes first. This means that HTML code after // ... ?> or # ... ?> WILL be printed: ?> breaks out of PHP mode and returns to HTML mode, and // or # cannot influence that. If the asp_tags configuration directive is enabled, it behaves the same with // %> and # %>. However, the </script> tag doesn't break out of PHP mode in a one-line comment.
<h1>This is an <?php # echo 'simple';?> example</h1> <p>The header above will say 'This is an example'.</p>
<?php /* echo 'This is a test'; /* This comment will cause a problem */ */ ?>