Sample Recursive function in PHP using laravel eloquent

Sample Recursive function in PHP using laravel eloquent


function generateSecureOtp($length = 6)
    {
        $characters = '23456789abcdefghjkmnpqrstuvwxyzABCDEFGHJKMNPQRSTUVWXYZ';
        $string = '';
        for ($i = 0; $i < $length; $i++) {
            $string .= $characters[mt_rand(0, strlen($characters) - 1)];
        }
        $exist = UserDetails::where('otp_value', $string)->first();
       
        if($exist) {
            return $this->generateSecureOtp(6);
        }else {
            return $string;
        }
    }