1. You don’t need to ask me for *both* my city/state *and* my ZIP. The latter implies the former. We have the technology.
2. If I enter a ZIP+4, and your system isn’t equipped to handle 10-character ZIP codes, just silently drop the final four digits. Here, I’ll give you the Perl code you need: $zip =~ s#(d{5})-(d{4})#$1#; . You can thank me later. (I gather that it’s similar in PHP.)
3. Don’t tell me to leave spaces out of my credit-card number. Again, we have the technology. ($credit_card =~ s#s+##g;)
4. Just don’t create a retail website. The only company that would be allowed to create a retail website in Stevetopia would be Amazon. Maybe Google.