Not many programming languages support this kind of feature. We are not talking about substitution of the values in a string. Instead, we want to reference the variable using strings in a dynamic manner. In PHP, the following code illustrates itself.
$a = "1234";
$b = "a";
echo $$b; //output 1234
This works because $b equals string a and $$b will just be deference as $a.
The same can be achieved using BASH.
bash-variable-substitution
Scripting languages are dynamic, loosely typed and do not require compilation, so it is likely that the languages supporting this feature are scripting.
–EOF (The Ultimate Computing & Technology Blog) —
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