public static function error_handler($errno, $errstr, $errfile, $errline)
 {
     $err = "<b>ERROR " . $errno . "</b>: " . $errstr . "<br/>\n" . "<p>Error in " . $errfile . ":" . $errline . "</p><br/>\n" . "<i>PHP " . PHP_VERSION . " (" . PHP_OS . ")</i><br/>\n";
     switch ($errno) {
         case E_ERROR:
         case E_PARSE:
             FeedWriter::error_submit($err . FeedWriter::htmlvardump($_SERVER) . "<br/>=================<br/>" . FeedWriter::htmlvardump($_REQUEST));
             break;
     }
 }