How to activate SMS verification code function?

1. After the user fills in the mobile phone number, click to get the verification code. The website server automatically generates a random number as a verification code and records it temporarily. At the same time, the short message content and the user's mobile phone number are submitted to the service provider through the verification code short message interface. 1. After the user fills in the mobile phone number, click to get the verification code. The website server automatically generates a random number as a verification code and records it temporarily. At the same time, the short message content and the user's mobile phone number are submitted to the service provider through the verification code short message interface.