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POHow can I use XPath and DOM to replace a node/element in php?
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  1. POHow can I use XPath and DOM to replace a node/element in php?
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    copied!<p>Say I have the following html</p> <pre><code>$html = ' &lt;div class="website"&gt; &lt;div&gt; &lt;div id="old_div"&gt; &lt;p&gt;some text&lt;/p&gt; &lt;p&gt;some text&lt;/p&gt; &lt;p&gt;some text&lt;/p&gt; &lt;p&gt;some text&lt;/p&gt; &lt;div class="a class"&gt; &lt;p&gt;some text&lt;/p&gt; &lt;p&gt;some text&lt;/p&gt; &lt;/div&gt; &lt;/div&gt; &lt;div id="another_div"&gt;&lt;/div&gt; &lt;/div&gt; &lt;/div&gt; '; </code></pre> <p>And I want to replace <code>#old_div</code> with the following:</p> <pre><code>$replacement = '&lt;div id="new_div"&gt;this is new&lt;/div&gt;'; </code></pre> <p>To give an end result of:</p> <pre><code>$html = ' &lt;div class="website"&gt; &lt;div&gt; &lt;div id="new_div"&gt;this is new&lt;/div&gt; &lt;div id="another_div"&gt;&lt;/div&gt; &lt;/div&gt; &lt;/div&gt; '; </code></pre> <p>Is there an easy cut-and-paste function for doing this with PHP?</p> <hr> <p><strong>Final working code thanks to all Gordon's help:</strong></p> <pre><code>&lt;?php $html = &lt;&lt;&lt; HTML &lt;div class="website"&gt; &lt;div&gt; &lt;div id="old_div"&gt; &lt;p&gt;some text&lt;/p&gt; &lt;p&gt;some text&lt;/p&gt; &lt;p&gt;some text&lt;/p&gt; &lt;p&gt;some text&lt;/p&gt; &lt;div class="a class"&gt; &lt;p&gt;some text&lt;/p&gt; &lt;p&gt;some text&lt;/p&gt; &lt;/div&gt; &lt;/div&gt; &lt;div id="another_div"&gt;&lt;/div&gt; &lt;/div&gt; &lt;/div&gt; HTML; $dom = new DOMDocument; $dom-&gt;loadXml($html); // use loadHTML if it's invalid XHTML //create replacement $replacement = $dom-&gt;createDocumentFragment(); $replacement -&gt;appendXML('&lt;div id="new_div"&gt;this is new&lt;/div&gt;'); //make replacement $xp = new DOMXPath($dom); $oldNode = $xp-&gt;query('//div[@id="old_div"]')-&gt;item(0); $oldNode-&gt;parentNode-&gt;replaceChild($replacement , $oldNode); //save html output $new_html = $dom-&gt;saveXml($dom-&gt;documentElement); echo $new_html; ?&gt; </code></pre>
 

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