DOMImplementation::hasFeature()

(PHP 5, PHP 7)

Test if the DOM implementation implements a specific feature

说明

publicDOMImplementation::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.

参数

$feature

The feature to test.

$version

The version number of the$featureto test. In level 2, this can be either2.0or1.0.

返回值

成功时返回TRUE，或者在失败时返回FALSE。

错误／异常

此方法可以被静态调用,但会抛出一个E_STRICT错误。

范例

Example #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'
);
               
foreach ($features as $key => $name) {
  if (DOMImplementation::hasFeature($key, '2.0')) {
    echo "Has feature $name\n";
  } else {
    echo "Missing feature $name\n";
  }
}
?>

参见

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