What are some best practices for separating server-side PHP logic from client-side JavaScript code?

To separate server-side PHP logic from client-side JavaScript code, it is best practice to use AJAX to make requests to the server for data or processing. This allows the PHP code to handle the server-side logic independently and return the necessary data to the client-side JavaScript for display or further processing. 

// server-side PHP code to handle AJAX request
if ($_SERVER['REQUEST_METHOD'] === 'POST') {
    // perform server-side logic
    $data = ['result' => 'success'];
    
    // return data as JSON response
    header('Content-Type: application/json');
    echo json_encode($data);
    exit;
}

Keywords

PHP JavaScript server-side client-side separation

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