You should read this:
If you only have five variables then using a loop and eval is a total waste of time and only serves to make your code slow, complex, obfuscated, and pointlessly hard to read. Why bother?
Rather than writing this awkward code, simply use an array. Indexing is neat, fast, easy to debug, easy to understand, and highly efficient. Or perhaps define a simple function and call that. But using eval on this problem is like cracking a walnut with steamroller.
