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Continue to ChatRender checkbox list with initially checked items in Yii2 https://onezeronull.com/2015/04/30/render-checkbox-list-with-initially-checked-items-in-yii2/
Render checkbox list with initially checked items in Yii2 https://onezeronull.com/2015/04/30/render-checkbox-list-with-initially-checked-items-in-yii2/