Test if the DOM implementation implements a specific feature

# DOMImplementation::hasFeature

(PHP 5, PHP 7, PHP 8)

DOMImplementation::hasFeature — Test if the DOM implementation implements a specific feature

### Beschreibung

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

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.

### Parameter-Liste

`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`.

### Rückgabewerte

Gibt bei Erfolg `true` zurück. Bei einem Fehler wird `false` zurückgegeben.

### Changelog

Version | Beschreibung
--- | ---
8.0.0 | Calling this function statically will now throw an Error. Previously, an `E_DEPRECATED` was raised.

### Beispiele

Beispiel #1 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'
    );

    $implementation = new DOMImplementation;

    foreach ($features as $key => $name) {
      if ($implementation->hasFeature($key, '2.0')) {
        echo "Has feature $name\n";
      } else {
        echo "Missing feature $name\n";
      }
    }

    ?>

### Siehe auch

- DOMNode::isSupported() - Checks if feature is supported for specified version

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