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<?xml version="1.0" encoding="iso-8859-1"?>
<!-- $Revision: 1.8 $ -->
<refentry id="function.dom-domdocument-getelementbyid">
<refnamediv>
<refname>DOMDocument->getElementById()</refname>
<refpurpose>Searches for an element with a certain id</refpurpose>
</refnamediv>
<refsect1 role="description">
&reftitle.description;
<classsynopsis>
<ooclass><classname>DOMDocument</classname></ooclass>
<methodsynopsis>
<type>DOMElement</type><methodname>getElementById</methodname>
<methodparam><type>string</type><parameter>elementId</parameter></methodparam>
</methodsynopsis>
</classsynopsis>
<para>
This function is similar to
<xref linkend="function.dom-domdocument-getelementsbytagname" /> but
searches for an element with a given id.
</para>
<para>
According to the DOM standard this requires a DTD which defines the
attribute ID to be of type ID. You need to validate your document with
<xref linkend="function.dom-domdocument-validate" />
or <literal>DOMDocument->validateOnParse</literal> before using this function.
</para>
</refsect1>
<refsect1 role="parameters">
&reftitle.parameters;
<para>
<variablelist>
<varlistentry>
<term><parameter>elementId</parameter></term>
<listitem>
<para>
The unique id value for an element.
</para>
</listitem>
</varlistentry>
</variablelist>
</para>
</refsect1>
<refsect1 role="returnvalues">
&reftitle.returnvalues;
<para>
Returns the <classname>DOMElement</classname> or &null; if the element is
not found.
</para>
</refsect1>
<refsect1 role="examples">
&reftitle.examples;
<example>
<title>DOMDocument->getElementById() Example</title>
<programlisting role="php">
<![CDATA[
<?php
$doc = new DomDocument;
// We need to validate our document before refering to the id
$doc->validateOnParse = true;
$doc->Load('book.xml');
echo "The element whose id is books is: " . $doc->getElementById('books')->tagName . "\n";
?>
]]>
</programlisting>
&example.outputs;
<screen>
<![CDATA[
The element whose id is books is: chapter
]]>
</screen>
</example>
</refsect1>
<refsect1 role="seealso">
&reftitle.seealso;
<para>
<simplelist>
<member><xref linkend="function.dom-domdocument-getelementsbytagname" /></member>
</simplelist>
</para>
</refsect1>
</refentry>
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