generating unparalleled codes php/mysql?


i'm operative fan needs beget millions alphanumeric codes used repository scratch-off cards, bottlecap prizes, on. have brief adequate imitation cap, wish certain obscure characters 1 i, 0 o, etc. included, have definitely stored destiny -- can't only have an algorithm determines 'validity' someone tries redeem one. finally, wish certain codes incidentally distributed inside infinite "code space" can't only speculation additional codes walking by alphabet.



are there any pointers towards graceful fit algorithms generating kinds formula sets? i've scratched few out behind an envelope, nonetheless problem smells trap unwary.



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