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Yii2 dropdown select optgroup

Yii2 dropdown select optgroup

I have struggled a lot, while figuring this out. Now I want to share what I managed to do. Situation: We have posts, and categories, each post attached to one category. Categories have 2 levels: parent and child. Post can be attached to child category only. Problem:¬†Get the select dropdown box of¬†categories with optgourp grouppings. […]