gan_node_html.php
function getPlainTextUTF8() {
		$txt = $this->toString(true, true, true);
		$enc = $this->getEncoding();
		if ($enc !== false) {
			$txt = mb_convert_encoding($txt, 'UTF-8', $enc);
		}
		return preg_replace('`\s+`', ' ', html_entity_decode($txt, ENT_QUOTES, 'UTF-8'));
	}
function getPlainTextUTF8() {
		$txt = $this->toString(true, true, true);
		$enc = $this->getEncoding();
		if ($enc !== false) {
			$txt = mb_convert_encoding($txt, 'UTF-8', $enc);
		}
		return preg_replace('`\s+`', ' ', html_entity_decode($txt, ENT_QUOTES, 'UTF-8'));
	}
Return plaintext taking document encoding into account
@return string