Php has thousands of spam messages coming in every day, and it's no use adding verification code! What's going on here? What can prawns do to stop this rubbish?

Obviously, your verification code is too simple and recognized by the recognition program. Baidu's verification code is also very simple, and general identification programs can identify it, but the purpose of big websites is to let everyone not waste time on verification codes. As proof, whenever it explodes, the bar owner will open the text message as a new verification code, which will make it unrecognizable by the recognition program.

What you need to do is to replace a set of verification code generation programs with shading and line interference, or write them, but the complexity of verification code will also cause users' disgust. In fact, the program of writing verification code in php is relatively simple, and you can also write it yourself.