Still looking for best and promising PHP framework. There are too many of PHP frameworks out there.
You can refer to this site of summary for some of the frameworks.
And you can take a look on poll result made by sitepoint on most popular PHP framework in 2014.
According to the site. Top 3 PHP frameworks are
- CodeIgniter & Yii
Don’t know how true it is but it can be as indicator to start doing the research further to find out.