"Or do you suggest to pass name of array variable as key?"

That was my intention, yes. And that was what I tried to demonstrate in my little example. It may not have been crystal clear, though.

"It is almost same as passing it as first argument as I suggested..."

Almost the same is not the same. TIMTOWTDI.

It wasn't my intention to step on your toes. Sorry if you feel it that way.

f--k the world!!!!
/dev/world has reached maximal mount count, check forced.