PHP - Manual: DOMImplementation::hasFeature
2025-10-31
(PHP 5, PHP 7, PHP 8)
DOMImplementation::hasFeature — Test if the DOM implementation implements a specific feature
   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.
featureThe feature to test.
version
       The version number of the feature to test. In 
       level 2, this can be either 2.0 or
       1.0.
      
| 版本 | 说明 | 
|---|---|
| 8.0.0 | Calling this function statically will
        now throw an Error.
        Previously, an E_DEPRECATEDwas raised. | 
示例 #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";
  }
}
?>官方地址:https://www.php.net/manual/en/domimplementation.hasfeature.php