Fatal error: Uncaught Error: Undefined constant "submit" in /home/mhd-01/www.cambioeurodollaro.it/htdocs/convertitore-euro-dollaro.php:13 Stack trace: #0 {main} thrown in /home/mhd-01/www.cambioeurodollaro.it/htdocs/convertitore-euro-dollaro.php on line 13