<?xml version="1.0" encoding="utf-8"?>
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<refentry xml:id="domimplementation.hasfeature" xmlns="http://docbook.org/ns/docbook" xmlns:xlink="http://www.w3.org/1999/xlink">
 <refnamediv>
  <refname>DOMImplementation::hasFeature</refname>
  <refpurpose>
   Test if the DOM implementation implements a specific feature
  </refpurpose>
 </refnamediv>
 <refsect1 role="description">
  &reftitle.description;
  <methodsynopsis role="DOMImplementation">
   <modifier>public</modifier> <type>bool</type><methodname>DOMImplementation::hasFeature</methodname>
   <methodparam><type>string</type><parameter>feature</parameter></methodparam>
   <methodparam><type>string</type><parameter>version</parameter></methodparam>
  </methodsynopsis>
  <para>
   Test if the DOM implementation implements a specific 
   <parameter>feature</parameter>.
  </para>
  <para>
   You can find a list of all features in the <link
   xlink:href="&url.dom2.features;">Conformance</link> section of the DOM
   specification.
  </para>
 </refsect1>
 <refsect1 role="parameters">
  &reftitle.parameters;
  <para>
   <variablelist>
    <varlistentry>
     <term><parameter>feature</parameter></term>
     <listitem>
      <para>
       The feature to test.
      </para>
     </listitem>
    </varlistentry>
    <varlistentry>
     <term><parameter>version</parameter></term>
     <listitem>
      <para>
       The version number of the <parameter>feature</parameter> to test. In 
       level 2, this can be either <literal>2.0</literal> or
       <literal>1.0</literal>.
      </para>
     </listitem>
    </varlistentry>
   </variablelist>
  </para>
 </refsect1>
 <refsect1 role="returnvalues">
  &reftitle.returnvalues;
  <para>
   &return.success;
  </para>
 </refsect1>

 <refsect1 role="changelog">
  &reftitle.changelog;
  <para>
   <informaltable>
    <tgroup cols="2">
     <thead>
      <row>
       <entry>&Version;</entry>
       <entry>&Description;</entry>
      </row>
     </thead>
     <tbody>
      <row>
       <entry>8.0.0</entry>
       <entry>
        Calling this function statically will
        now throw an <classname>Error</classname>.
        Previously, an <constant>E_DEPRECATED</constant> was raised.
       </entry>
      </row>
     </tbody>
    </tgroup>
   </informaltable>
  </para>
 </refsect1>
 <refsect1 role="examples">
  &reftitle.examples;
  <example>
   <title>Testing your DOM Implementation</title>
   <programlisting role="php">
<![CDATA[
<?php

$features = array(
  'Core'           => 'Core module',
  'XML'            => 'XML module',
  'HTML'           => 'HTML module',
  'Views'          => 'Views module',
  'Stylesheets'    => 'Style Sheets module',
  'CSS'            => 'CSS module',
  'CSS2'           => 'CSS2 module',
  'Events'         => 'Events module',
  'UIEvents'       => 'User interface Events module',
  'MouseEvents'    => 'Mouse Events module',
  'MutationEvents' => 'Mutation Events module',
  'HTMLEvents'     => 'HTML Events module',
  'Range'          => 'Range module',
  'Traversal'      => 'Traversal module'
);
               
foreach ($features as $key => $name) {
  if (DOMImplementation::hasFeature($key, '2.0')) {
    echo "Has feature $name\n";
  } else {
    echo "Missing feature $name\n";
  }
}

?>
]]>
   </programlisting>
  </example>
 </refsect1>
 <refsect1 role="seealso">
  &reftitle.seealso;
  <para>
   <simplelist>
    <member><methodname>DOMNode::isSupported</methodname></member>
   </simplelist>
  </para>
 </refsect1>
</refentry>
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