PHP only

Question

Ia it enough to build a web using only PHP language?

Answer 1

you can but it isn't good

Answer 2

yes it is possible to build or sometime impossible too, but why did you think to do such ? You need to embedded code with HTML , use CSS ,js , Ajax and then your web app look like #PRO,
I said it's impossible because how did you handle forms ? for that you will require HTML right !