Checks if a node represents a comment

# tidyNode::isComment

(PHP 5, PHP 7, PHP 8)

tidyNode::isComment — Checks if a node represents a comment

### 说明

public function tidyNode::isComment(): bool

Tells if the node is a comment.

### 参数

此函数没有参数。

### 返回值

Returns `true` if the node is a comment, `false` otherwise.

### 示例

示例 #1 Extract comments from a mixed HTML document

    <?php

    $html = <<< HTML
    <html><head>
    <?php echo '<title>title</title>'; ?>
    <#
      /* JSTE code */
      alert('Hello World');
    #>
    </head>
    <body>

    <?php
      // PHP code
      echo 'hello world!';
    ?>

    <%
      /* ASP code */
      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 children
        if($node->hasChildren()) {
            foreach($node->child as $child) {
                get_nodes($child);
            }
        }
    }

    ?>

以上示例会输出：

    # comment node #1
    <!-- Comments -->

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