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PHP supports 'C', 'C++' and Unix shell-style (Perl 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 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.

&#60;h1&#62;This is an &#60;?php # echo 'simple';?&#62; example.&#60;/h1&#62;
&#60;p&#62;The header above will say 'This is an  example'.&#60;/p&#62;

'C' style comments end at the first */ encountered. Make sure you don't nest 'C' style comments. It is easy to make this mistake if you are trying to comment out a large block of code.

&#60;?php
/*
    echo 'This is a test'; /* This comment will cause a problem */
*/
?&#62;

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