What is the logic of php to realize the verification and registration function of mobile phone verification code?

The logic of mobile phone registration verification is as follows:

First of all, we need to find short message service providers such as Monternet, Cloud Messenger and Huyi Wireless to apply for a short message sending interface.

The website implementation process is as follows:

Step 1: Enter the mobile phone number when the user registers. The website must first verify whether this number is the correct mobile phone number through JS or ajax+php.

Step 2: The user clicks to send the mobile phone verification code, and the mobile phone number is transmitted to php through ajax. At this time, php generates a random verification code and saves it in the session, and then sends it to this mobile phone number through the SMS interface.

Step 3: The user enters the verification code received by the mobile phone to register. The website compares the verification code in the conversation with the verification code entered by the user.