Php generates a random and unique invitation code/discount code with a fixed length

Php generates a random and unique invitation code with a fixed length.

Function make_coupon_card () {$ code = 'abcdefghijklmnopqrstuvwxy'; $ rand = $ code [rand (0, 25)]. strtoupper (dechex (date ('M '))). date ('D '). substr (time (),-5 ). substr (microtime (), 2, 5 ). sprintf ('% 02d', rand (0, 99); for ($ a = md5 ($ rand, true), $ s = '0123456789abcdefghijklmnopqrstuv ', $ d = '', $ f = 0; $ f <8; $ g = ord ($ a [$ f]), $ d. = $ s [($ g ^ ord ($ a [$ f + 8])-$ g & 0x1F], $ f ++); return $ d ;} echo make_coupon_card ();

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