How to fetch data from localhost using PHP and React JS | How to display json data in react js

How to fetch data from localhost using PHP and React JS | How to make API using PHP and my sql | how to display json data in react js

use below command for installing and creating react app:
-- first install nodejs
-- npm install react --save
-- npm install react-dom --save
-- npx create-react-app my-app
-- cd my-app
-- npm start

PHP core:
/****Simply add this code in you .php file and call it when required****/
if (isset($_SERVER['HTTP_ORIGIN'])) {
   header("Access-Control-Allow-Origin: {$_SERVER['HTTP_ORIGIN']}");
   header('Access-Control-Allow-Credentials: true');
   header('Access-Control-Max-Age: 86400');    // cache for 1 day
}
if ($_SERVER['REQUEST_METHOD'] == 'OPTIONS') {
   if (isset($_SERVER['HTTP_ACCESS_CONTROL_REQUEST_METHOD']))
       header("Access-Control-Allow-Methods: GET, POST, PUT, DELETE, OPTIONS");
   if (isset($_SERVER['HTTP_ACCESS_CONTROL_REQUEST_HEADERS']))
       header("Access-Control-Allow-Headers: {$_SERVER['HTTP_ACCESS_CONTROL_REQUEST_HEADERS']}");
}
/************************/
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