PHP Manual
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# 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. If asp_tags configuration directive is enabled, it behaves the same with `// %>`.

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