I am new to Yii 2, Normally I use Yii 1 to develop web application, now Yii have new version of Yii (Yii 2), Do I really need to go for Yii 2? Is there any security risk in Yii 1?
Because as I see Yii 2 is totally changed from Yii 1.
Yes !!, Yii 2 is completely different from Yii 1. There Is Difference in Structure Based: http://www.yiiframework.com/doc-2.0/guide-intro-upgrade-from-v1.html
https://github.com/yiisoft/yii2-app-basic
https://github.com/yiisoft/yii2-app-advanced
Difference In Basic And Advanced
Note: At The End You Have To Go With Yii2 Due To its Advance Advantages: