PHP is often used because it's mature, reasonable secure these days, and has world-class encryption libraries. Lots of companies develop web applications in it.

PHP is often used because it's mature, reasonable secure these days, and has world-class encryption libraries. Lots of companies develop web applications in it.... But if you're developing a web application that you host and also want to offer a private version of for enterprise use, this is somewhat appealing because it's the first step of being able to package the PHP app within a Go binary that runs on a lot of platforms and not have to release your source code. Sure you could write it in Go from the start, but if you already have a bunch written or want to use less expensive developers, this might work out one day.