How does PHP enable mobile apps to store information to ECS instances and apps to pull information from ECS instances?

How does PHP implement storing information in the mobile APP to the ECS and pulling the APP's information from the ECS as a question? for help, please come and help me.

Reply to discussion (solution)

You are too tired of this problem. there will be more code to write.
Roughly
Write a URL on the PHP Server. remove the mobile APP.
For example, pulling server information
Www.xx.com/a.php

A. php code
Echo "my server information is available ";

Upload mobile phone information to the server
Www.xx.com/ B .php

B. php code
$ _ REQUEST ['name'];

In this way, the server can receive the message sent by the mobile phone.

The mobile APP is mainly used to request the URL specified by the Access Server. it can communicate with each other.
There are many things to learn, such as customizing private tokens.