php-doc-en/reference/dom/functions/dom-domxpath-query.xml

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  <refentry id="function.dom-domxpath-query">
   <refnamediv>
    <refname>DOMXPath->query</refname>
    <refpurpose>
     Evaluates the XPath expression in the given string 
    </refpurpose>
   </refnamediv>
   <refsect1>
    &reftitle.description;
    <classsynopsis>
     <ooclass><classname>DOMXPath</classname></ooclass>
     <methodsynopsis>
      <type>DOMNodeList</type>
      <methodname>query</methodname>
      <methodparam><type>string</type><parameter>expression</parameter></methodparam>
      <methodparam choice="opt"><type>DOMNode</type><parameter>contextnode</parameter></methodparam>      
     </methodsynopsis>
    </classsynopsis>
    <para>
     Returns a DOMNodeList containing all nodes matching 
     <parameter>expression</parameter>. Any expression which do not return 
     nodes will return an empty DOMNodeList.
    </para>
    <para>
     The optional <parameter>contextnode</parameter> can be specified for doing 
     relative XPath queries. 
    </para>
   </refsect1>
  </refentry>

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