Take "the three top web languages of [blank]" as "the three [descriptive adjective] of [list]"
No one can argue that PHP, Ruby & Python are some top of the top languages on the web. Didn't mean for "the" to seem as limiting as you took it.
My interpretation wasn't entirely unfair. The "for" and double "of" result in an ambiguous meaning. "top" is most commonly a superlative, similar to "best" or "most popular", as in "the three best actors". But you used it in a different sense, as in "three top actors" (though this doesn't usually work with "the" before it.)
I do see where you're coming from though and what you intended so this is mostly linguistic wankery for a good Friday night in ;-)