Take a look at Phrozn: http://www.phrozn.info/en/ – it’s pretty much a port of Jekyll to PHP.
I made Orbiter (on GitHub) for creating simple websites out of markdown documents via PHP. It uses Mustache for templating and supports Markdown by default. It uses plain text files as source documents so you can use both Git and Dropbox for syncing the documents. It is also dynamic, which means you don’t have to manually “generate” your website after every update.