function generate(){
$keys = "qwertyuiopasdfghjklzxcvbnmQWERTYUIOPASDFGHJKLZXCVBNM123456789";
for ($a=0; $a <= 12; $a++){
$rand = rand(0,strlen($keys));
$result .= $keys[$rand];
}
return $result;
}
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