You are trying to use symbolic refs. This is usually a bad idea (and you should always use strict to avoid it...), but in case you know what you're doing and insist:
the expression:
test-$number-$string Is like  'test' - $string - $number
So, in all of the three push statements, you're pushing to the array @{-9} (strings are like 0 in numeral context, both 'vol1' and 'vol2', and the - operator implies numberal context).
What you'd probably want to do is use them as strings, such as:
@{"test-$contextID-$vol[0]"}

In reply to Re: pushing a $variable into an array with varible name by Ido
in thread pushing a $variable into an array with varible name by han_perl

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