Yii 2 - Upgrade to bootstrap 4
Yes it is! If you upgrade your Yii 2 assets on your installation, there will be many difficulties to use the bootstrap 3 css and js files using the Yii 2 assets. So be sure you need bootstrap 4 only for your projects. First of all we update the dependencies on our composer,json file.
{ "require": { "yiisoft/yii2": "~2.0.*", "yiisoft/yii2-bootstrap": "~2.1.0@dev", "bower-asset/bootstrap": "~4.0.0@alpha", "bower-asset/jquery": "2.2.*" }}Application config
That's all but now we will have another problem. We have to update the configurations of our frontend project. On your config\main.php:
'components' => [ ... 'assetManager' => [ 'appendTimestamp' => true, 'linkAssets' => false, 'class' => 'yii\web\AssetManager', 'bundles' => [ 'yii\web\JqueryAsset' => [ 'js' => [ YII_ENV_DEV ? 'jquery.js' : 'jquery.min.js' ] ], 'yii\bootstrap\BootstrapAsset' => [ 'css' => [ YII_ENV_DEV ? 'css/bootstrap.min.css' : 'css/bootstrap.min.css', ], ], 'yii\bootstrap\BootstrapPluginAsset' => [ 'js' => [ YII_ENV_DEV ? 'js/bootstrap.js' : 'js/bootstrap.min.js', ] ] ], ], ...],
Admin LTE
If you use Admin LTE, you CANNOT upgrade your app to boostrap 4 because the bootstrap 4 assets will not work with Admin LTE. You have to build your new admin area with a bootstrap 4 admin template and it will not be easy. There are many amazing templates available online but I am not sure you will have a lot of time to work on a new admin area and integrate into your PHP application. I am sure there will be a lot of work. We don't have to reinvent the wheel so I think we will continue to use AdminLTE and bootstrap 3 in this case.