Since strings evaluate to themselves, you could just change one line to this:

   $hold[$i] = eval "$_";
[download]

And as gaal mentions above, it's very dicy and highly insecure. You're essentially running unknown code -- even if you wrote the contents of the file yourself, a typo can cause havoc.

Update
gaal's comment below is correct. I misspoke. But the warning about eval'ing input strings is still true.