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    <p>DOMXpath is affected by the load*() methods on DOMDocument. After loading a new xml or html, you need to recreate the DOMXpath instance:</p> <pre><code>$xml = '&lt;xml/&gt;'; $dom = new DOMDocument(); $dom-&gt;loadXml($xml); $xpath = new DOMXpath($dom); var_dump($xpath-&gt;document === $dom); // bool(true) $dom-&gt;loadXml($xml); var_dump($xpath-&gt;document === $dom); // bool(false) </code></pre> <p>In DOMXpath_reuser() you store a static variable and recreate the xpath depending on the file name. If you want to reuse an Xpath object, suggest extending DOMDocument. This way you only need pass the $dom variable around. It would work with a stored xml file as well with xml string or a document your are creating.</p> <p>The following class extends DOMDocument with an method xpath() that always returns a valid DOMXpath instance for it. It stores and registers the namespaces, too:</p> <pre><code>class MyDOMDocument extends DOMDocument { private $_xpath = NULL; private $_namespaces = array(); public function xpath() { // if the xpath instance is missing or not attached to the document if (is_null($this-&gt;_xpath) || $this-&gt;_xpath-&gt;document != $this) { // create a new one $this-&gt;_xpath = new DOMXpath($this); // and register the namespaces for it foreach ($this-&gt;_namespaces as $prefix =&gt; $namespace) { $this-&gt;_xpath-&gt;registerNamespace($prefix, $namespace); } } return $this-&gt;_xpath; } public function registerNamespaces(array $namespaces) { $this-&gt;_namespaces = array_merge($this-&gt;_namespaces, $namespaces); if (isset($this-&gt;_xpath)) { foreach ($namespaces as $prefix =&gt; $namespace) { $this-&gt;_xpath-&gt;registerNamespace($prefix, $namespace); } } } } $xml = &lt;&lt;&lt;'ATOM' &lt;feed xmlns="http://www.w3.org/2005/Atom"&gt; &lt;title&gt;Test&lt;/title&gt; &lt;/feed&gt; ATOM; $dom = new MyDOMDocument(); $dom-&gt;registerNamespaces( array( 'atom' =&gt; 'http://www.w3.org/2005/Atom' ) ); $dom-&gt;loadXml($xml); // created, first access var_dump($dom-&gt;xpath()-&gt;evaluate('string(/atom:feed/atom:title)', NULL, FALSE)); $dom-&gt;loadXml($xml); // recreated, connection was lost var_dump($dom-&gt;xpath()-&gt;evaluate('string(/atom:feed/atom:title)', NULL, FALSE)); </code></pre>
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    1. POIn DomDocument, reuse of DOMXpath, it is stable?
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    1. COThanks about your first explanation (!), showing what I am interpreting as a correction on my `DOMXpath_reuser()` function: the line `if ($file!=$docName) ...` must be correct to `if ( $file!=$docName || ($xp && $doc !== $xp->document) ) ...`, **is it?** About second explanation I not understand why you explaining namespaces procedures, I not see the point in the question.
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      1. USPeter Krauss
    2. COI understood that you were looking for "instabilities". My fault. I changed the answer to show a possible solution for DOMXpath reuse, without depending on file names or static variables.
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    3. CONice answer. +1
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      1. USAmal Murali
 

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