protected function new_element_value(&$signal)
{
$element = $signal->data_element($this->from_data_key($signal));
$sub = get_subelement($element, $this->from_sublevels);
unset_subelement($element, $this->from_sublevels);
$signal->set_data_element($element, $data_key);
return $sub;
}
function unset_subelement($compound, $subspath)
{
if (empty($subspath) && !($subspath === 0)) {
return NULL;
}
if (is_array($subspath)) {
$level = array_shift($subspath);
} else {
$level = $subspath;
$subspath = NULL;
}
if (is_array($compound) && array_key_exists($level, $compound)) {
if (empty($subspath)) {
unset($compound[$level]);
} else {
$compound[$level] = unset_subelement($compound[$level], $subspath);
}
} elseif (is_object($compound) && property_exists($level, $compound)) {
if (empty($subspath)) {
unset($compound->{$level});
} else {
$compound->{$level} = unset_subelement($compound[$level], $subspath);
}
}
return $compound;
}
protected function new_element(&$signal)
{
$element = $signal->data_element($this->default_data_key);
return unset_subelement($element, $this->sublevels);
}
