Creating include file for calling indicator

Hi, devoloper

I would like to have a function that return indicator's value easily. Because indicator in mql5 must be declared in onit() and then copying array. It is too complex.

the function should return value by passing the parameter of indicator such as..

-movingaverage(symbol,timeframe,its parameter......)

-rsi(symbol,timeframe,its parameter..)

-Bollinger(symbol,timeframe,its parameter..)

I need only 3 indy above in include file. and the same function can be used as multiple times . they should be independent from each other.