用php查找和编辑html的注释元素

问题描述

我需要编辑以下评论标签的内部，以便我可以更改css文件的位置。这需要通过PHP完成。

评论部分：

  
试试 
 
 
  libxml_use_internal_errors（TRUE）; 
 $ dom = new DOMDocument; 
 $ dom-> loadHTMLFile（'http://www.nytimes.com/'）; 
 libxml_clear_errors（）; 
 
 $ xpath = new DOMXPath（$ dom）; 
 foreach（$ xpath-> query（'// comment（）[contains（。，link）]'）as $ node）
 {
 var_dump（$ node-> ;数据）; 
} 
  
这将给出： 
 
 
  string（135）[if IE]> 
< link rel =stylesheettype =text / csshref =http：// graphics8 （138）[if IE 6] .ytimes.com / css / 0.1 / screen / build / homepage / ie.css> 
<！[endif]
 
 string（138） > 
< link rel =stylesheettype =text / csshref =http://graphics8.nytimes.com/css/0.1/screen/build/homepage/ie6.css> 
   
正如您所看到的，实际的评论节点是只是<！ -  和  - > 部分。其余的只是文字。  [如果IE]> 不是实际标签的一部分。这是字符数据。
 
I need to edit the inside of the following comment tag so that I can change the location of the css file. This needs to be done through PHP. I have tried using the following code but I get invalid expression errors.
Comment Section:
<!--[if IE 6]><link rel="stylesheet" type="text/css" href="/Css/IE6.css" media="screen" /><![endif]-->
Code that does not work:
    $csslist = $xpath->query("//<!--[if IE 6]>");
foreach($csslist as $css) {
    $css->innertext = 'test';
}
 解决方案 
Try "//comment()" to get all CommentNodes.
Note that the link element in the CommentNode is not a childNode of the commentNode but mere data:
libxml_use_internal_errors(TRUE);
$dom = new DOMDocument;
$dom->loadHTMLFile( 'http://www.nytimes.com/' );
libxml_clear_errors();

$xpath = new DOMXPath($dom);
foreach( $xpath->query('//comment()[contains(., "link")]') as $node)
{
   var_dump( $node->data );
}
This will give:
string(135) "[if IE]>
    <link rel="stylesheet" type="text/css" href="http://graphics8.nytimes.com/css/0.1/screen/build/homepage/ie.css">
<![endif]"

string(138) "[if IE 6]>
    <link rel="stylesheet" type="text/css" href="http://graphics8.nytimes.com/css/0.1/screen/build/homepage/ie6.css">
<![endif]"
As you can see, the actual comment node is just the <!-- and --> parts. The remainder is just text. The [if IE]> is not part of the actual tag. It is character data.
                        
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