to unify @amir_anwar and @mgiambanco .
PHP can be used as an API or you can use a container to make it look like it's "an app" but in the end PHP runs on the sever not the client.
So in short -> NO atm you cannot use PHP for a native APP.
What you can do is -> write the app in angular or react or vue or cycle or another javascript framework of your choice and use PHP as the server cloud API backend.
that's for example how whatsapp was built it was a dumb PHP script that grew and grew :)
you can take a look into phonegap / cordova or react native or the ionic framework.
@chilimatic XD totally agree with you, i just think it's good not because of angular, but because, it has a repo system and a testapp for quick tests :)