PHP Manual
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# Comments

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

      1
      2 <?php
      3     echo "This is a test"; // This is a one-line c++ style comment
      4     /* This is a multi line comment
      5        yet another line of comment */
      6     echo "This is yet another test";
      7     echo "One Final Test"; # This is shell-style style comment
      8 ?>
      9

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

      1
      2 <h1>This is an <?# echo "simple";?> example.</h1>
      3 <p>The header above will say 'This is an example'.
      4

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

      1
      2 <?php
      3  /*
      4     echo "This is a test"; /* This comment will cause a problem */
      5  */
      6 ?>
      7

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