What are some best practices for handling checkbox selections in PHP forms?

When handling checkbox selections in PHP forms, it is important to remember that checkboxes are only included in the form data when they are checked. This means that you need to check if the checkbox is set in the form data before processing its value. One common approach is to use the isset() function to check if the checkbox is selected, and then assign a default value if it is not selected.

// Check if the checkbox is set in the form data
if(isset($_POST['checkbox_name'])){
    $checkbox_value = $_POST['checkbox_name'];
} else {
    $checkbox_value = 'default_value';
}