How to write short message interface in php?

The SMS interface can be widely used to trigger SMS applications such as mobile phone verification of website members, order notification and logistics reminder. Technical implementation 1. Users fill in their mobile phone numbers and click the "Get Verification Code" button. 2. The website generates SMS verification code according to the rules, and sends the user's mobile phone number and verification code content to the verification code SMS platform through the SMS verification interface. 3. After a series of judgments (account balance, content compliance, mobile phone number compliance, and the operator to which the mobile phone number belongs), the verification code SMS platform submits the information to the server of the corresponding operator. 4. The operator sends the SMS content to the user's mobile phone.