How can you use the isset function in PHP to check if checkbox data has been submitted before processing it further?

When processing form data in PHP, it's important to check if checkbox data has been submitted before trying to access it. This can be done using the isset function to determine if the checkbox input field exists in the form data. By checking if the checkbox data is set, you can avoid errors when trying to access the value of the checkbox.

// Check if checkbox data has been submitted
if(isset($_POST['checkbox_name'])) {
    // Process the checkbox data further
    $checkbox_value = $_POST['checkbox_name'];
    
    // Additional processing code here
} else {
    // Checkbox data was not submitted
    // Handle this case accordingly
}