protected static function readIPTC($iptc, $value, $glue=", ") {
		if (isset($iptc[$value])){
			return implode($glue, $iptc[$value]);
		} else {
			return null;
		}
	}
protected static function readIPTC($iptc, $value, $glue=", ") {
		if (isset($iptc[$value])){
			return implode($glue, $iptc[$value]);
		} else {
			return null;
		}
	}
protected static function readIPTC ( $ iptc , $ value , $ glue = ", " ) { if ( isset ( $ iptc [ $ value ] ) ) { return implode ( $ glue , $ iptc [ $ value ] ) ; } else { return null ; } }
reads the iptc information of a certain value

@param array $iptc array with iptc values
@param string $value array key of value
@param string $glue
@return string
reads the iptc information of a certain value