Support Context assistance when entering functions arguments

[pombredanne]

This is a feature that exists in the Java editor, by
which a pop-up comes above the line which lists the
functions arguments that you are entering, WHILE you
are typing them.
Today you get that information in a hover while
hoerving over a function name only, but you do no get
it when typing the functions arguments.
The java editor does it.

[rbarreca]

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user_id=1147469

I was about to add this as a feature request.  I keep
pressing CTRL+Space after typing "my_function(" and expect
to get the info about what argument I'm on, but instead I
get variable suggestions.  Then I have to move my hand ALL
the way over to my mouse, hover over the function name and
figure out which argument I'm on....phew! That's a lot of
work. ;-)

+1 for this.

[zergusvcv]

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user_id=1488981

Agreed with both previous opinions and +5 votes more from 
me an my team. This is very useful and necessary function.
And thanks a lot for excellent work!

[ts77]

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user_id=31828

Yeah, I'm very much interested in this feature too.
Thats the only thing keeping me from scraping zend ide,
otherwise phpeclipse already outperforms it.