function genRandomString($length) {
//$length = 10;
$characters = '0123456789abcdefghijklmnopqrstuvwxyz';
$string = '';
for ($p = 0; $p < $length; $p++)
{
$string .= $characters[mt_rand(0, strlen($characters))];
}
return $string;
}
echo strtoupper(genRandomString(10));
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