如何使用PHP DOMDocument删除属性?

时间:2012-05-16 13:10:40

标签: php domdocument

使用这段XML:

<my_xml>
  <entities>
    <image url="lalala.com/img.jpg" id="img1" />
    <image url="trololo.com/img.jpg" id="img2" />
  </entities>
</my_xml> 

我必须摆脱图像标签中的所有属性。所以,我做到了这一点:

<?php

$article = <<<XML
<my_xml>
  <entities>
    <image url="lalala.com/img.jpg" id="img1" />
    <image url="trololo.com/img.jpg" id="img2" />
  </entities>
</my_xml>  
XML;

$doc = new DOMDocument();
$doc->loadXML($article);
$dom_article = $doc->documentElement;
$entities = $dom_article->getElementsByTagName("entities");

foreach($entities->item(0)->childNodes as $child){ // get the image tags
  foreach($child->attributes as $att){ // get the attributes
    $child->removeAttributeNode($att); //remove the attribute
  }
}

?>

当我尝试删除foreach块中的from属性时,看起来内部指针会丢失并且不会删除这两个属性。

还有另一种方法吗?

提前致谢。

1 个答案:

答案 0 :(得分:7)

将内部foreach循环更改为:

while ($child->hasAttributes())
  $child->removeAttributeNode($child->attributes->item(0));

或者回到前面删除:

if ($child->hasAttributes()) { 
  for ($i = $child->attributes->length - 1; $i >= 0; --$i)
    $child->removeAttributeNode($child->attributes->item($i));
}

或制作属性列表的副本:

if ($child->hasAttributes()) {
  foreach (iterator_to_array($child->attributes) as $attr)
    $child->removeAttributeNode($attr);
}

其中任何一个都可以。