Yii2 Config for CDN-assets with current versions from Composer

config.php

<?php

$bundles = [];
foreach(json_decode(file_get_contents(__DIR__ . '/composer.lock'))->packages as $package) {
    if (!preg_match('#^bower-asset/(.+)$#', $package->name, $name) or !preg_match('#^v?(.+)$#', $package->version, $version)) {
        continue;
    }
    $name = $name[1];
    $version = $version[1];
    switch ($name) {
        case 'jquery':
            $bundles['yii\web\JqueryAsset'] = [
                'sourcePath' => null,
                'css' => [],
                'js' => ['//cdnjs.cloudflare.com/ajax/libs/jquery/' . $version . '/jquery.min.js'],
            ];
            break;
        case 'tether':
            $bundles['yii\bootstrap\TetherAsset'] = [
                'sourcePath' => null,
                'css' => ['//cdnjs.cloudflare.com/ajax/libs/tether/' . $version . '/css/tether.min.css'],
                'js' => ['//cdnjs.cloudflare.com/ajax/libs/tether/' . $version . '/js/tether.min.js'],
            ];
            break;
        case 'bootstrap':
            $bundles['yii\bootstrap\BootstrapAsset'] = [
                'sourcePath' => null,
                'css' => ['//cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/' . $version . '/css/bootstrap.min.css'],
                'js' => [],
            ];
            $bundles['yii\bootstrap\BootstrapPluginAsset'] = [
                'sourcePath' => null,
                'css' => [],
                'js' => ['//cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/' . $version . '/js/bootstrap.min.js'],
            ];
            break;
        case 'font-awesome':
            $bundles['common\assets\FontAwesomeAsset'] = [
                'sourcePath' => null,
                'css' => ['//cdnjs.cloudflare.com/ajax/libs/font-awesome/' . $version . '/css/font-awesome.min.css'],
                'js' => [],
            ];
            break;
    }
}

$config = [
    //...
    'components' => [
        //...
        'assetManager' => [
            'linkAssets' => true,
            'bundles' => $bundles,
        ],
    ],
];

//...

return $config;

Integrating CDN in Yii2 is quite easy. Yii2 has some open source packages that configure CDN services for delivering assets such as CSS and JavaScript files, like blacksmoke26/yii2cdn package. If you have this package installed, create a CDN directory in the root and install the asset in it. Open web.php under config folder and add cdn property under component. Define two version of the files, one for the local and another for the live version. Add code, something like this, in the view:

Yii::$app->cdn->get('font-awesome')->register();

source: https://www.cloudways.com/blog/cdn-in-yii2/