PHP DomDocument-如何用另一個節點替換節點中的文本

Question

我有一個節點：

<p>
    This is a test node with Figure 1.
</p>

我的目標是用一個子節點替換“圖1”：

<xref>Figure 1</xref>

這樣最終結果將是：

<p>
    This is a test node with <xref>Figure 1</xref>.
</p>

先感謝您。

Answer 1

Xpath允許您從文檔中獲取包含字符串的文本節點。 然后，您必須將其拆分為文本和元素（xref）節點的列表，並將該節點插入文本節點之前。 最后刪除原始文本節點。

$xml = <<<'XML'
<p>
    This is a test node with Figure 1.
</p>
XML;
$string = 'Figure 1';

$dom = new DOMDocument();
$dom->loadXml($xml);
$xpath = new DOMXpath($dom);

// find text nodes that contain the string
$nodes = $xpath->evaluate('//text()[contains(., "'.$string.'")]');
foreach ($nodes as $node) {
  // explode the text at the string
  $parts = explode($string, $node->nodeValue);
  // add a new text node with the first part
  $node->parentNode->insertBefore(
    $dom->createTextNode(
      // fetch and remove the first part from the list
      array_shift($parts)
    ),
    $node
  );
  // if here are more then one part
  foreach ($parts as $part) {
    // add a xref before it
    $node->parentNode->insertBefore(
      $xref = $dom->createElement('xref'),
      $node
    );
    // with the string that we used to split the text
    $xref->appendChild($dom->createTextNode($string));
    // add the part from the list as new text node
    $node->parentNode->insertBefore(
      $dom->createTextNode($part), 
      $node
    );
  }
  // remove the old text node
  $node->parentNode->removeChild($node);
} 

echo $dom->saveXml($dom->documentElement);

輸出：

<p>
    This is a test node with <xref>Figure 1</xref>.
</p>

Answer 2

您可以首先使用getElementsByTagName()查找要查找的節點，然后從該節點的nodeValue中刪除搜索文本。 現在，創建新節點，將nodeValue設置為搜索文本，並將新節點附加到主節點：

<?php

$dom = new DOMDocument;
$dom->loadHTML('<p>This is a test node with Figure 1</p>');

$searchFor = 'Figure 1';

// replace the searchterm in given paragraph node
$p_node = $dom->getElementsByTagName("p")->item(0);
$p_node->nodeValue = str_replace($searchFor, '', $p_node->nodeValue);

// create the new element
$new_node = $dom->createElement("xref");
$new_node->nodeValue = $searchFor;

// append the child element to paragraph node
$p_node->appendChild($new_node);

echo $dom->saveHTML();

輸出：

<p>This is a test node with <xref>Figure 1</xref></p>

演示