我有这个结构:
<p>Second paragraph</p> <p>First paragraph</p> <p>Third paragraph</p>
我想用PHP DOM重新排列元素,把它变成这样的东西:
<p>First paragraph</p> <p>Second paragraph</p> <p>Third paragraph</p>
我尝试使用以下代码执行此操作:
$html = "<p>Second paragraph</p><p>First paragraph</p><p>Third paragraph</p>"; $dom = new domDocument; $dom->loadHTML( $html ); $dom->getElementsByTagName('p')->item(1)->insertBefore($dom->getElementsByTagName('p')->item(0));
但是当我使用时:
echo $dom->getElementsByTagName('p')->item(0)->nodeValue;
我明白了:
First paragraphSecond paragraph
结果,所以我想我在这里做错了.
从
PHP Documentation:
public DOMNode DOMNode::insertBefore ( DOMNode $newnode [,DOMNode $refnode ] ) refnode The reference node. If not supplied,newnode is appended to the children.
因此,由于您未指定引用节点,因此它会将其附加到子节点.您的代码将生成此HTML:
<html> <body> <p>First paragraph<p>Second paragraph</p></p> <p>Third paragraph</p> </body> </html>
你需要做的是在parentNode上执行insertBefore,参考第二段,如下所示:
$nodes = $dom->getElementsByTagName('p'); $nodes->item(0)->parentNode->insertBefore($nodes->item(1),$nodes->item(0)); echo $dom->saveHTML();
输出:
<html> <body> <p>First paragraph</p> <p>Second paragraph</p> <p>Third paragraph</p> </body> </html>
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