PMA\libraries\dbi\DBIExtension::getError PHP Method

    public function getError($link);

 /**
  * returns last error message or false if no errors occurred
  *
  * @param object $link connection link
  *
  * @return string|bool $error or false
  */
 public function getError($link = null)
 {
     $link = $this->getLink($link);
     if ($link === false) {
         return false;
     }
     return $this->_extension->getError($link);
 }