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    DOMImplementation::hasFeature

    (PHP 5, PHP 7, PHP 8)

    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 either 2.0 or 1.0.

    返回值

    成功时返回 true， 或者在失败时返回 false。

    更新日志

    版本 说明
    8.0.0 Calling this function statically will now throw an Error. Previously, an E_DEPRECATED was raised.

    示例

    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'
    );

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

    ?>

    参见

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