What are some best practices for handling form data in PHP, especially when dealing with radio buttons?

When handling form data in PHP, especially with radio buttons, it is important to properly validate and sanitize user input to prevent security vulnerabilities such as SQL injection or cross-site scripting. One best practice is to use the isset() function to check if the radio button value has been set before processing it. Additionally, you can use a switch statement to handle different radio button options.

if(isset($_POST['radio_button'])) {
    $selected_option = $_POST['radio_button'];
    
    switch($selected_option) {
        case 'option1':
            // Handle option 1
            break;
        case 'option2':
            // Handle option 2
            break;
        // Add more cases for additional options
    }
}