Process::getPercent

public function getPercent()
{
	$percent = $this->stage > 0 ? $this->stages[$this->stage - 1]['PERCENT'] : 0;

	$addit = 0;
	$cb = (string)($this->stages[$this->stage]['SUBPERCENT_CALLBACK'] ?? '');
	if ($cb !== '' && method_exists($this, $cb))
	{
		$addit = $this->$cb();
	}

	return $percent + $addit;
}