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