php基于getAttribute从html中删除标签

问题描述：

How can I limit which link tag is removed by specifying $tag->getAttribute('rel') = "icon"? I tried adding a simple if statement to the $remove[] $tags as $tag; line...code ran through, but the link with rel="icon" line was not at all removed.

So in this example the whole link tag should be removed from the html:

<link rel="icon" type="image/png" href="/images/favicon.ico" />


$html = file_get_contents($url);
$dom = new DOMDocument();
$dom->loadHTML($html);

$tags = $dom->getElementsByTagName('link');

$remove = [];
foreach($tags as $tag) {
    $remove[] = $tag;
}

foreach ($remove as $tag) {
    $tag->parentNode->removeChild($tag); 
}

UPDATE Answer here: @prodigitalson provided the following which initially did not work:

$html = file_get_contents($url);
$dom = new DOMDocument();
$dom->loadHTML($html);
$finder = new DOMXpath($dom);
$tags = $finder->query('//link[@rel="icon"]');

foreach ($tags as $tag)
{
$tag->parentNode->removeChild($tag); 
}

by adding the following line as the last line of the code...worked perfect.

$html = $dom->saveHTML();

如何通过指定$ tag-＆gt; getAttribute（'rel'来限制删除哪个链接标记）=“icon” code>？我尝试将一个简单的if语句添加到 $ remove [] $标签作为$ tag; code> line ...代码运行，但链接 rel =“icon” code> 线路根本没有被删除。 p>

因此，在此示例中，应从html中删除整个链接标记： p>


 ＆lt; link rel =“icon”type =  “image / png”href =“/ images / favicon.ico”/＆gt; 
 
 
 $ html = file_get_contents（$ url）; 
 $ dom = new DOMDocument（）; 
 $ dom-＆gt;  loadHTML（$ html）; 
 
 $ tags = $ dom-＆gt; getElementsByTagName（'link'）; 
 
 $ remove = []; 
foreach（$ tags as $ tag）{
 $ remove [  ] = $ tag; 
} 
 
foreach（$ remove as $ tag）{
 $ tag-＆gt; parentNode-＆gt; removeChild（$ tag）;  
} 
  code>  pre> 
 
 更新答案：
 @ prodigitalson提供了以下最初不起作用的内容： p> 
 
 
  $ html = file_get_contents（$ url）; 
 $ dom = new DOMDocument（）; 
 $ dom-＆gt; loadHTML（$ html）; 
 $ finder = new DOMXpath（$ dom）; 
 $ tags =  $ finder-＆gt; query（'// link [@ rel =“icon”]'）; 
 
foreach（$ tags as $ tag）
 {
 $ tag-＆gt; parentNode-＆gt; removeChild（$ 标签）;  
   pre> 
 
 将以下行添加为代码的最后一行...工作正常。 p> 
 
 
  $ html = $ dom-＆gt; saveHTML（）; 
  code>  pre> 
  div>

答

You can get these all with an xpath:

$html = file_get_contents($url);
$dom = new DOMDocument();
$dom->loadHTML($html);
$finder = new DOMXpath($dom);
$tags = $finder->query('//link[@rel="icon"]');
$toRemove = array();

foreach ($tags as $tag)
{
  $toRemove[] = $tag;
}

// with array walk
array_walk(function($elem) { $elem->parentNode->removeChild($elem); }, $toRemove);

// with foreach
foreach ($toRemove as $tag) {
  $tag->parentNode->removeChild($tag);
}

答

You can use easy way with function str_replace:

<?php

//$html = file_get_contents($url);

$html = '<a rel="icon" href="#">link</a>';
$html = str_replace('rel="icon"', 'rel=""', $html);

echo $html;
?>

php基于getAttribute从html中删除标签

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