@'. */ public static function generateRandomPeer(string $domain, int $length=16, string $prefix='userTest'): string { $characters = '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ'; $charactersLength = strlen($characters); $randomString = ''; for ($i = 0; $i < $length; $i++) { $randomString .= $characters[rand(0, $charactersLength - 1)]; } return sprintf('%s%s@%s', $prefix, $randomString, $domain); } }