If you are returning the value and the label in the field settings, it gets complicated. There isn’t an easy way to access the nested array values. We need to set a marker to see if we find it selected.
$values = get_field('checkbox_field_name');
$field = get_field_object('checkbox_field_name');
$choices = $field['choices'];
foreach ($choices as $choice_value => $choice_label) {
echo $choice_label,': ';
$found = false;
foreach ($values as $value) {
if ($value['value'] == $choice_value) {
$found = true;
echo 'checked';
}
} // end foreach $values
if (!$found) {
echo 'not ckecked';
}
} // end foreach $choices
