In Yii2, to override a view from a common extension or widget, follow these steps:

1. Find the View You Want to Override
First, locate the view file in the extension or widget. For example, if the extension is kartik-v/yii2-widget-datepicker, the view might be located under:

vendor/kartik-v/yii2-widget-datepicker/views/datepicker.php

2. Create an Override Path
To override the view, Yii2 uses its path alias system. You can configure a custom view path in your application’s configuration file.

In your config/main.php or config/web.php (depending on where you’re configuring the application), add an alias that points to your custom view directory:

‘components’ => [
‘view’ => [
‘theme’ => [
‘pathMap’ => [
‘@vendor/kartik-v/yii2-widget-datepicker/views’ => ‘@app/views/custom-datepicker’,
],
],
],
],

In this example:

@vendor/kartik-v/yii2-widget-datepicker/views is the original path of the widget’s view files.
@app/views/custom-datepicker is the directory where your custom views will be placed.

3. Create the Custom View File
Now, create the custom view file in the mapped directory. For example, if the original view is datepicker.php, your new view will be in:

@app/views/custom-datepicker/datepicker.php

Copy the content from the original view and modify it as needed.

4. Clear Cache (Optional)
If Yii2 caching is enabled, you might need to clear the cache after overriding the view:

./yii cache/flush-all

5. Test the Override
After setting everything up, test to ensure your custom view is being used instead of the original one. If the path mapping is correct, your modifications should reflect in the application.

This approach works not only for widgets but for overriding any extension view files.

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