What are the best practices for developing client-side applications with PHP?

When developing client-side applications with PHP, it is important to separate client-side and server-side logic to ensure a clean and maintainable codebase. Utilizing AJAX calls to communicate between the client and server can help improve performance and user experience. Additionally, using a front-end framework such as Vue.js or React can streamline the development process and create a more interactive user interface.

// Example of using AJAX with PHP to fetch data from the server

// client-side JavaScript code
$.ajax({
    url: 'get_data.php',
    method: 'GET',
    success: function(data) {
        console.log(data);
    }
});

// server-side PHP code (get_data.php)
$data = array('name' => 'John Doe', 'age' => 30);
echo json_encode($data);