Yes,I think PHP being utilized for more modest activities in spite of the fact that it might be utilized for bigger ones too.
Following are few advantages:
1.Open Source, PHP is completely free.
2.PHP can be easily embedded directly into HTML.
3.Platform independent can run on Windows Linux or Mac servers.
4.Run faster on the internet and easily integrate AJAX, Callback etc.
5.Interfaces very easily with Apache/MySQL
6.Lots of good books and on-line help.