Doom: Add PHP mode

doom/init.el

@@ -144,7 +144,7 @@
         ;;+pomodoro        ; be fruitful with the tomato technique
         +present)        ; using org-mode for presentations
        ;;perl              ; write code no one else can comprehend
-       ;;php               ; perl's insecure younger brother
+       php               ; perl's insecure younger brother
        ;;plantuml          ; diagrams for confusing people more
        ;;purescript        ; javascript, but functional
        python            ; beautiful is better than ugly