public function getKey($keyname) {
        $i = $this->findKeyInArray($keyname);
        if ($i !== null) {
            return $this->keys[$i];
        }
        return null;
    }
public function getKey($keyname) {
        $i = $this->findKeyInArray($keyname);
        if ($i !== null) {
            return $this->keys[$i];
        }
        return null;
    }
public function getKey ( $ keyname ) { $ i = $ this -> findKeyInArray ( $ keyname ) ; if ( $ i !== null ) { return $ this -> keys [ $ i ] ; } return null ; }
Returns one xmldb_key
@param string $keyname
@return xmldb_key|null
Returns one xmldb_key