Are there best practices for processing checkbox values in PHP scripts?

When processing checkbox values in PHP scripts, it is important to check if the checkbox was checked or not before trying to access its value. This can be done by using the isset() function to determine if the checkbox was submitted in the form data. If the checkbox was checked, its value will be included in the form data, otherwise it will not be set.

if(isset($_POST['checkbox_name'])) {
    // Checkbox was checked
    $checkbox_value = $_POST['checkbox_name'];
    // Process the checkbox value here
} else {
    // Checkbox was not checked
    // Handle the case where the checkbox was not checked
}