如何将属性 rel='no flollow' 添加到 div 内的所有锚标记 [简单 html 文档]

Question

我在这里使用简单的 html 文档从源代码中获取数据，然后根据我的需要对其进行过滤

//including script
include($config>root.'/script/vendor/simple_html_dom/simple_html_dom.php');

//getting all data
$url = "www.example.com";

$html = file_get_html($url, $use_include_path = false, $context=null, $offset = -1, $maxLen=-1, $lowercase = true, $forceTagsClosed=true, $target_charset = DEFAULT_TARGET_CHARSET, $stripRN=false, $defaultBRText=DEFAULT_SPAN_TEXT , $defaultSpanText=DEFAULT_SPAN_TEXT);

//title
$title = $html->find('#question-header h1 a',0)->innertext;

//comments
foreach($html->find('#question .comment-body') as $element) {
$question_comments[] = $element->innertext;
}

//{running a lot of loops like above}

//{than i have a final result inside output}
$output = ob_get_clean();
{here i need some stack help to add attribute to all anchor tags inside a particular div}      
echo $output;   
?>

例如，这是我在 $output 变量中得到的

$output = "

<!DOCTYPE html>
<html lang='en'>
<head>
    <meta charset='UTF-8'>
    <title>Example</title>
</head>
<body>
    <div class='container'>
        <a href='/link-1'></a>
        <div class='data'>
            <a href='/link-2'></a>
            <a href='/link-3'></a>
            <a href='/link-4'></a>
        </div>
    </div>

    <div class='footer'>
        <a href='/new-link'></a>
    </div>
</body>
</html>

"; 我想将属性 rel='no-follow' 添加到 container

内的所有锚标签

Answer 1

试试这个。希望这个会有所帮助。

如果您希望此解决方案也适用于更多嵌套标签，您可以删除注释。

Try this code snippet here

<?php
ini_set('display_errors', 1);
$string =<<<HTML
<!DOCTYPE html>
<html lang='en'>
<head>
    <meta charset='UTF-8'>
    <title>Example</title>
</head>
<body>
    <div class='container'>
        <a href='/link-1'></a>
        <div class='data'>
            <a href='/link-2'></a>
            <a href='/link-3'></a>
            <a href='/link-4'></a>
        </div>
    </div>

    <div class='footer'>
        <a href='/new-link'></a>
    </div>
</body>
</html>
HTML;

$domDocument = new DOMDocument();
$domDocument->loadHTML($string);

$domXPath = new DOMXPath($domDocument);
$results = $domXPath->query("//div[@class='container']/*");
foreach($results as $result)
{
    if($result instanceof DOMElement && $result->tagName=="a")
    {
        $result->setAttribute("rel", "no-follow");       
    }
    else
    {
        addAttribute($result);
    }
}

function addAttribute($result)
{
    global $domXPath;
    $results = $domXPath->query("./a",$result);//change query to ./* to make it work with nested HTML. 
    foreach($results as $result)
    {
        if($result instanceof DOMElement && $result->tagName=="a")
        {
            $result->setAttribute("rel", "no-follow");       
        }
        //Uncomment these lines to work with more nested HTML.
        //else 
        //{
        //    addAttribute($result);
        //}
    }
}
echo $domDocument->saveHTML();

如何将属性 rel='no flollow' 添加到 div 内的所有锚标记 [简单 html 文档]

how to add attribute rel='no flollow' to all anchor tags inside div [simple html doc]

php

preg-replace

preg-match-all

simple-html-dom