Php/docs/domimplementation.hasfeature
DOMImplementation::hasFeature
(PHP 5, PHP 7)
DOMImplementation::hasFeature — Test if the DOM implementation implements a specific feature
说明
public DOMImplementation::hasFeature
( string $feature
, string $version
) : bool
Test if the DOM implementation implements a specific
feature
.
You can find a list of all features in the » Conformance section of the DOM specification.
参数
feature
- The feature to test.
version
- The version number of the
feature
to test. In level 2, this can be either2.0
or1.0
.
返回值
成功时返回 true
, 或者在失败时返回 false
。
错误/异常
此方法可以被静态调用,但会抛出一个 E_STRICT
错误。
范例
Example #1 Testing your DOM Implementation
<?php$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"; }}?>