使用php DOM api删除元标记的麻烦 [英] trouble in removing the meta tag using php DOM api

问题描述

$html = new DOMDocument();
           $html->loadHTMLFile($filename);

           $meta = $html->getElementsByTagName("meta");


           foreach($meta as $oldmeta_tags)
           {

               $parent = $oldmeta_tags->parentNode;
               $parent->removeChild($oldmeta_tags);

           }
         echo "<br>Number of bytes stored = ".$html->saveHTMLFile($filename);
           $result[] = file_get_contents($filename);

某些元标记被删除，有些则不是。请帮助我做错了

Some of the meta tags are removed and some are not. please help what i am doing wrong

推荐答案

当您使用 foreach 迭代 DOMNodeList 并删除元素，您正在更改 DOMNodeList 内容，因此节点将被跳过。您必须向后迭代：

When you use foreach to iterate over the DOMNodeList and remove an element, you are changing the DOMNodeList content, so nodes will be skipped. You have to iterate backwards:

$nodes = $dom->getElementsByTagName('meta');
for ($i = $nodes->length - 1; $i >= 0; $i--) {
    $nodes->item($i)->parentNode->removeChild($nodes->item($i));
}

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