DOMImplementation::hasFeature

(PHP 5, PHP 7)

Test if the DOM implementation implements a specific feature

public bool DOMImplementation::hasFeature ( string $feature, string $version )

Test if the DOM implementation implements a specific feature.

You can find a list of all features in the » Conformance section of the DOM specification.

Parameters:

feature

The feature to test.

version

The version number of the feature to test. In level 2, this can be either 2.0 or 1.0.

Returns:

Returns TRUE on success or FALSE on failure.

Exception:

This method may be called statically, but will issue an E_STRICT error.

Examples:

Testing your DOM Implementation

<?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";
  }
}
 
?>