protected function getUnavailableKeys()
	{
		preg_match_all('(' . preg_quote($this->keyPrefix) . '.)', $this->xsl, $matches);

		return array_unique($matches[0]);
	}
protected function getUnavailableKeys()
	{
		preg_match_all('(' . preg_quote($this->keyPrefix) . '.)', $this->xsl, $matches);

		return array_unique($matches[0]);
	}
protected function getUnavailableKeys ( ) { preg_match_all ( '(' . preg_quote ( $ this -> keyPrefix ) . '.)' , $ this -> xsl , $ matches ) ; return array_unique ( $ matches [ 0 ] ) ; }
Return the list of possible dictionary keys that appear in the original stylesheet

@return string[]
Return the list of possible dictionary keys that appear in the original stylesheet