Converts the variable value to a string representation. If the variable is not currently valid, it is NOT validated.
Return
the string value of the variable. If the variable is an array, it will to be of the form "1, 2, 3" for one-dimensional arrays or "bounds[3,3] {1, 2, 3, 4, 5, 6, 7, 8, 9}" for multi-dimensional arrays.
