To integrate AJAX with PHP, first, create an HTML element (like a button) that triggers the AJAX request. Use jQuery or vanilla JavaScript to send an AJAX request to a PHP script, specifying the request type (GET or POST) and any data to send. In the PHP script, process the incoming data, perform any necessary actions (like querying a database), and return a response. Finally, use the AJAX success callback to handle the response and update the webpage dynamically without reloading.

PHP, AJAX, and jQuery together enable dynamic web applications. PHP handles server-side processing, AJAX allows asynchronous data exchange without page reloads, and jQuery simplifies JavaScript tasks, including making AJAX requests to interact with PHP scripts. This combination creates a seamless, interactive user experience.

To prevent clients from seeing your PHP/AJAX source code, keep sensitive code on the server side and only expose necessary APIs. Use server-side scripts to handle logic, while AJAX requests retrieve data. Additionally, use minification or obfuscation for JavaScript files, and implement security measures like HTTPS and proper authentication to protect against unauthorized access.