function random_num($size) {
$alpha_key = ”;
$keys = range(‘A’, ‘Z’);
for ($i = 0; $i < 2; $i++) {
$alpha_key .= $keys[array_rand($keys)];
}
$length = $size – 2;
$key = ”;
$keys = range(0, 9);
for ($i = 0; $i < $length; $i++) {
$key .= $keys[array_rand($keys)]; }
return $alpha_key . $key; } echo random_num(9);
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