Under PHP 3.0.16, I could use the extract function to append extract variables from an array and attach a prefix to each one. Often, this was a number. I could do it because "".$int made the integer $int into a string. However, under PHP 4.0.5, the same operation returns 0, even if I use settype to make $int into a string beforehand. The only solution I can find is to use something like:
extract($array, EXTR_PREFIX_ALL, "x".$int)

instead of 

extract($array, EXTR_PREFIX_ALL, "".$int)

(In all of my examples, $array is the product of mysql_fetch_assoc()).