The following type of comparison in sanitizeInputValues() is used to ascertain if a string value is actually a string:

if(is_int($value) || $value==(int)$value) $ok = true;

However, the following comparisons are true at least in PHP 5.2.10:

"1%6" == 1```

"3ab4" == 3```

Apparently the typecasting engine always returns the first "number" part of the string, regardless of the rest; if the first character is not a number, the return will be 0.

I suggest the following modification to solve the issue:

if(is_int($value) || (string)$value==(string)((int)$value)) $ok = true;

This will assure that the comparisons will not be made between a string and an integer directly, thus avoiding the bug.

Keywords: sanitizeInputValues, getRequestVar, sanitize, int, string