php-doc-en/reference/dom/functions/dom-domimplementation-hasfeature.xml

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<!-- $Revision: 1.5 $ -->
  <refentry id='function.dom-domimplementation-hasfeature'>
   <refnamediv>
    <refname>DOMImplementation->hasFeature</refname>
    <refpurpose>
     Test if the DOM implementation implements a specific feature
    </refpurpose>
   </refnamediv>
   <refsect1>
    &reftitle.description;
    <classsynopsis>
     <ooclass><classname>DOMImplementation</classname></ooclass>
     <methodsynopsis>
      <type>bool</type>
      <methodname>hasFeature</methodname>
      <methodparam><type>string</type><parameter>feature</parameter></methodparam>
      <methodparam><type>string</type><parameter>version</parameter></methodparam>
     </methodsynopsis>
    </classsynopsis>
    <para>
     Test if the DOM implementation implements a specific 
     <parameter>feature</parameter>. &return.success;
    </para>
    <para>
     You can find a list of all features in the <ulink
     url="&url.dom2.features;">Conformance</ulink> section of the DOM
     specification.
    </para>
    <para>
     <parameter>version</parameter> is the version number of the feature to
     test. In level 2, this can be either <literal>2.0</literal> or
     <literal>1.0</literal>.
    </para>
    <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>
  </refentry>

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