mirror of
https://github.com/sigmasternchen/php-doc-en
synced 2025-03-19 18:38:55 +00:00
c030e2adf7
- All id attributes are now xml:id - Add docbook namespace to all root elements - Replace <ulink /> with <link xlink:href /> - Minor markup fixes here and there git-svn-id: https://svn.php.net/repository/phpdoc/en/trunk@238160 c90b9560-bf6c-de11-be94-00142212c4b1
155 lines
3.9 KiB
XML
155 lines
3.9 KiB
XML
<?xml version="1.0" encoding="iso-8859-1"?>
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<!-- $Revision: 1.11 $ -->
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<refentry xml:id="function.dom-domxpath-query" xmlns="http://docbook.org/ns/docbook">
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<refnamediv>
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<refname>DOMXPath->query()</refname>
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<refpurpose>
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Evaluates the given XPath expression
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</refpurpose>
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</refnamediv>
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<refsect1 role="description">
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&reftitle.description;
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<classsynopsis>
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<ooclass><classname>DOMXPath</classname></ooclass>
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<methodsynopsis>
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<type>DOMNodeList</type><methodname>query</methodname>
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<methodparam><type>string</type><parameter>expression</parameter></methodparam>
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<methodparam choice="opt"><type>DOMNode</type><parameter>contextnode</parameter></methodparam>
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</methodsynopsis>
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</classsynopsis>
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<para>
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Executes the given XPath <parameter>expression</parameter>.
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</para>
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</refsect1>
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<refsect1 role="parameters">
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&reftitle.parameters;
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<para>
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<variablelist>
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<varlistentry>
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<term><parameter>expression</parameter></term>
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<listitem>
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<para>
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The XPath expression to execute.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><parameter>contextnode</parameter></term>
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<listitem>
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<para>
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The optional <parameter>contextnode</parameter> can be specified for
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doing relative XPath queries. By default, the queries are relative to
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the root element.
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</para>
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</listitem>
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</varlistentry>
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</variablelist>
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</para>
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</refsect1>
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<refsect1 role="returnvalues">
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&reftitle.returnvalues;
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<para>
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Returns a <classname>DOMNodeList</classname> containing all nodes matching
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the given XPath <parameter>expression</parameter>. Any expression which do
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not return nodes will return an empty <classname>DOMNodeList</classname>.
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</para>
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</refsect1>
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<refsect1 role="examples">
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&reftitle.examples;
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<para>
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<example>
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<title>Getting all the english books</title>
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<programlisting role="php">
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<![CDATA[
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<?php
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$doc = new DOMDocument;
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// We don't want to bother with white spaces
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$doc->preserveWhiteSpace = false;
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$doc->Load('book.xml');
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$xpath = new DOMXPath($doc);
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// We starts from the root element
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$query = '//book/chapter/para/informaltable/tgroup/tbody/row/entry[. = "en"]';
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$entries = $xpath->query($query);
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foreach ($entries as $entry) {
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echo "Found {$entry->previousSibling->previousSibling->nodeValue}," .
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" by {$entry->previousSibling->nodeValue}\n";
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}
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?>
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]]>
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</programlisting>
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&example.outputs;
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<screen>
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<![CDATA[
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Found The Grapes of Wrath, by John Steinbeck
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Found The Pearl, by John Steinbeck
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]]>
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</screen>
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<para>
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We can also use the <parameter>contextnode</parameter> parameter to shorten
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our expression:
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</para>
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<programlisting role="php">
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<![CDATA[
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<?php
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$doc = new DOMDocument;
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$doc->preserveWhiteSpace = false;
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$doc->load('book.xml');
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$xpath = new DOMXPath($doc);
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$tbody = $doc->getElementsByTagName('tbody')->item(0);
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// our query is relative to the tbody node
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$query = 'row/entry[. = "en"]';
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$entries = $xpath->query($query, $tbody);
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foreach ($entries as $entry) {
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echo "Found {$entry->previousSibling->previousSibling->nodeValue}," .
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" by {$entry->previousSibling->nodeValue}\n";
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}
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?>
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]]>
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</programlisting>
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</example>
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</para>
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</refsect1>
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<refsect1 role="seealso">
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&reftitle.seealso;
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<para>
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<simplelist>
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<member><xref linkend="function.dom-domxpath-evaluate" /></member>
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</simplelist>
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</para>
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</refsect1>
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</refentry>
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<!-- Keep this comment at the end of the file
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Local variables:
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mode: sgml
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sgml-omittag:t
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sgml-shorttag:t
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sgml-minimize-attributes:nil
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sgml-always-quote-attributes:t
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sgml-indent-step:1
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sgml-indent-data:t
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indent-tabs-mode:nil
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sgml-parent-document:nil
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sgml-default-dtd-file:"../../../../manual.ced"
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sgml-exposed-tags:nil
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sgml-local-catalogs:nil
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sgml-local-ecat-files:nil
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End:
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vim600: syn=xml fen fdm=syntax fdl=2 si
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vim: et tw=78 syn=sgml
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vi: ts=1 sw=1
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-->
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