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We also use PHP for general occation, why? we think you already know the reason . . . of course because is the most flexible language on earth that can colaborate very well with all language.
for the strusture is HTML & CSS ( who does not know ? ) cause it's the basic language use for the web and help us creating a very outstanding view. its become important cause it make our system looks good in front of the eyes of our client, (doest agree?), Hm . . . let me ask you if you have a good software but with bad UI/UX, do people use it? cause for it we can reach our goals.
What about Microsoft technology, why not. . . We always strive to remain the best and try to keep developing what we have.