How can PHP developers ensure that checkbox values are successfully transmitted in form submissions?

When working with checkboxes in HTML forms, PHP developers need to ensure that the checkbox values are successfully transmitted in form submissions by checking if the checkbox is checked and setting a default value if it's not. This can be done by using the isset() function to check if the checkbox value is set in the $_POST array and assigning a default value if it's not.

// Check if the checkbox is checked and set a default value if it's not
$checkbox_value = isset($_POST['checkbox_name']) ? $_POST['checkbox_name'] : '0';