There are several questions about PHP frameworks, but I\'m curious as to which one(s) are used in the commercial world when developing web applications with PHP. At my first web
In last two three places I've worked the company had their own (private, built in-house) framework.
Having experience with CI , yiiframework and calephp (not much, really) my opinion is that CI is not flexible as ohter 2, so I do not recommend it on larger-scale projects. Anyone who disagree, just can try a demo project with cakephp and Yii and he will see how things are easier with them as crud,form validation etc. Of course all have their disadvantages :)
The only enterprise-level framework I can think is Zend Framework. CakePHP, Code Igniter and others are only focused on RAD development.
According to a PHP Framework Popularity at Work survey by Sitepoint in 2015 (7554 survey participants) the five most used frameworks are
Furthermore survey results indicate, that
There seem to be continent specific framework preferences: In America and Asia, Laravel seems to be the framework of choice (except for Russia: Yii 2), whereas in Europe you'll find more Symfony2.
(Be aware that this is just referenced from one source -- see links above.)