now there is a CAPTCHA sent, and then the client requests to come back, compare it, and then determine whether it is successful or not. But I don"t know where to store this CAPTCHA! Please give me some advice
now there is a CAPTCHA sent, and then the client requests to come back, compare it, and then determine whether it is successful or not. But I don"t know where to store this CAPTCHA! Please give me some advice
suggest learning how to get started with database
find
well cache key/value
cookie