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(PHP 5 >= 5.0.1)
tidyNode::isComment — Checks if a node represents a comment
Tells if the node is a comment.
   Returns  TRUE  if the node is a comment,  FALSE  otherwise.
  
Example #1 Extract comments from a mixed HTML document
  <?php
$html  = <<< HTML
 <html><head>
<?php echo '<title>title</title>'; ?>
<# 
  
  alert('Hello World'); 
#>
</head>
<body>
<?php
  // PHP code
  echo 'hello world!';
?>
<%
  
  response.write("Hello World!")
%>
<!-- Comments -->
Hello World
</body></html>
Outside HTML
 HTML;
 $tidy  =  tidy_parse_string ( $html );
 $num  =  0 ;
 get_nodes ( $tidy -> html ());
function  get_nodes ( $node ) {
     // check if the current node is of requested type
     if( $node -> isComment ()) {
        echo  "\n\n# comment node #"  . ++ $GLOBALS [ 'num' ] .  "\n" ;
        echo  $node -> value ;
    }
     // check if the current node has childrens
     if( $node -> hasChildren ()) {
        foreach( $node -> child  as  $child ) {
             get_nodes ( $child );
        }
    }
}
 ?>   以上例程会输出:
# jste node #1
<# 
  
  alert('Hello World'); 
#>
 Note:
This function was named tidy_node::is_comment() in PHP 4/Tidy 1.