php - Converting a checkbox to a boolean

Depending on the submission-mechanism of an HTML form, any checkbox element values may be seen as 'on', 'off', 1, 0, 'true', 'false'.

Is there a helper in the Laravel framework that can "cast" a submitted FormData checkbox (or a plain form) to a boolean.

I could roll my own, but asking here is worth a shot.

Here is what I would use:

function checkbox_boolean($parameter) {
    if (is_bool($parameter)) return $parameter;
    if (is_object($parameter)) return count(get_object_vars($parameter)) !== 0;
    if (is_array($parameter)) return count($parameter) !== 0;
    if (is_numeric($parameter)) { return (boolean) $parameter; }
    $p = is_string($parameter) ? strtolower($parameter) : $parameter;


    switch ($p) {
        case 'yes';
        case 'on';
        case 'true';
            return true;
            break;

        case null;
        case 'no';

        case 'off';
        case 'false';
            return false;
            break;
    }
    return false;
}

print_r([
    'yes' => [

        '"true"' => checkbox_boolean('true'),
        'true' => checkbox_boolean(true),
        '1' => checkbox_boolean(1),
        '"1"' => checkbox_boolean('1'),
        'yes' => checkbox_boolean('yes'),
        'YEs' => checkbox_boolean('YEs'),
        '' => checkbox_boolean((object) [ 'z' => 'z']),
        '' => checkbox_boolean([0]),
    ],
    'no' => [

        '"false"' => checkbox_boolean('false'),
        'false' => checkbox_boolean(false),
        '0' => checkbox_boolean(0),
        '"0"' => checkbox_boolean('0'),
        'no' => checkbox_boolean('no'),
        'No' => checkbox_boolean('No'),
        '' => checkbox_boolean(new stdClass),
        '' => checkbox_boolean([]),
    ]
]);

---

This question is not a duplicate of "How to convert strings to boolean" because this is not a generic problem. I am asking about the specific process of converting HTML forms, or rather checkbox elements to boolean. An important part of the question/problem is identifying the common values that these checkboxes generate when submitted by various (common) methods and parsed by PHP.