I'm developing app with Yii framework. I need from dropdown list with checkboxes as values of this list. I've been searching about this but didn't find anything. Can someone help me with this task?
Here is the link to a Yii extension which does exactly what you want!
Yii Framework Extension: echmultiselect
On top of that, there are other Yii extensions for multiselect features that are also quite interesting! you might also want to take a look at these as well!