function make_coupon_card() {
$code = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ';
$rand = $code[rand(0,25)]
.strtoupper(dechex(date('m')))
.date('d').substr(time(),-5)
.substr(microtime(),2,5)
.sprintf('%02d',rand(0,99));...
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function make_coupon_card() {
$code = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ';
$rand = $code[rand(0,25)]
.strtoupper(dechex(date('m')))
...