Perhaps not the most elegant way, but hey, it works!
/**
* Prevents a field from being updated from the panel in ACF.
* Useful for business-critical fields that must only by updated internally, but still need to be visible on the admin panel.
*/
function prevents_field_from_being_updated_from_the_panel($value, $post_id, $field) {
$backtraces = debug_backtrace();
foreach ($backtraces as $backtrace) {
if (!empty($backtrace['function']) && $backtrace['function'] == 'update_field') {
return $value;
}
}
return get_field('field_5b5fcd08f9ecf', $post_id, false); # Change field_{key} to your field key/name
}
# If you have the field Key:
add_filter('acf/update_value/key=YOUR_FIELD_KEY', 'prevents_field_from_being_updated_from_the_panel', 10, 3);
# If you prefer to use field name:
# add_filter('acf/update_value/name=YOUR_FIELD_NAME', 'prevents_field_from_being_updated_from_the_panel', 10, 3);
