How get value for unchecked checkbox in checkbox elements when form posted?

Question

I have a form like below :

Answer 1

Try this one:

for ($i = 1; $i<=3; $i++) {
    $_POST["status_$i"] = isset($_POST["status_$i"]) ? $_POST["status_$i"] : 0; // 0 if not set
}

var_dump($_POST);