File: xpath.xml

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<?xml version="1.0" encoding="utf-8"?>
<!-- $Revision$ -->
<refentry xml:id="simplexmlelement.xpath" xmlns="http://docbook.org/ns/docbook">
 <refnamediv>
  <refname>SimpleXMLElement::xpath</refname>
  <refpurpose>Runs XPath query on XML data</refpurpose>
 </refnamediv>
 
 <refsect1 role="description">
  &reftitle.description;
  <methodsynopsis role="SimpleXMLElement">
   <modifier>public</modifier> <type class="union"><type>array</type><type>null</type><type>false</type></type><methodname>SimpleXMLElement::xpath</methodname>
   <methodparam><type>string</type><parameter>expression</parameter></methodparam>
  </methodsynopsis>
  <para>
   The <literal>xpath</literal> method searches the SimpleXML node for
   children matching the <acronym>XPath</acronym> <parameter>expression</parameter>.
  </para>
 </refsect1>

 <refsect1 role="parameters">
  &reftitle.parameters;
  <para>
   <variablelist>
    <varlistentry>
     <term><parameter>expression</parameter></term>
     <listitem>
      <para>
       An XPath path
      </para>
     </listitem>
    </varlistentry>
   </variablelist>
  </para>
 </refsect1>

 <refsect1 role="returnvalues">
  &reftitle.returnvalues;
  <para>
   Returns an <type>array</type> of SimpleXMLElement objects on success; or &null; or &false; in
   case of an error.
  </para>
 </refsect1>

 <refsect1 role="examples">
  &reftitle.examples;
  <para>
   <example>
    <title>Xpath</title>
    <programlisting role="php">
<![CDATA[
<?php
$string = <<<XML
<a>
 <b>
  <c>text</c>
  <c>stuff</c>
 </b>
 <d>
  <c>code</c>
 </d>
</a>
XML;

$xml = new SimpleXMLElement($string);

/* Search for <a><b><c> */
$result = $xml->xpath('/a/b/c');

foreach ($result as $node) {
    echo '/a/b/c: ',$node,"\n";
}

/* Relative paths also work... */
$result = $xml->xpath('b/c');

foreach ($result as $node) {
    echo 'b/c: ',$node,"\n";
}
?>
]]>
    </programlisting>
    &example.outputs;
    <screen>
<![CDATA[
/a/b/c: text
/a/b/c: stuff
b/c: text
b/c: stuff
]]>
    </screen>
    <simpara>
     Notice that the two results are equal.
    </simpara>
   </example>
  </para>
 </refsect1>

  <refsect1 role="seealso">
  &reftitle.seealso;
  <para>
   <simplelist>
    <member><methodname>SimpleXMLElement::registerXPathNamespace</methodname></member>
    <member><methodname>SimpleXMLElement::getDocNamespaces</methodname></member>
    <member><methodname>SimpleXMLElement::getNamespaces</methodname></member>
    <member><xref linkend="simplexml.examples-basic"/></member>
   </simplelist>
  </para>
 </refsect1>

</refentry>
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