Yii and CodeIgniter are the most popular web frameworks used among PHP developers in the global market today. However, it might be now the question is which framework is more suitable and when it must be used at the right time. Both frameworks to ensure various differences and they are open source.
As it growth and popularity in chart, prominent reason why Yii is a unique framework since it attracts many web developers due to its stunning features like caching, authentication, rapid development, scaffolding, testing, etc. CodeIgniter is best known for its simple and elegant platform.