Warning: fopen(dati.txt): Failed to open stream: Permission denied in /var/www1/demos/online/index.php on line 5

Fatal error: Uncaught TypeError: fwrite(): Argument #1 ($stream) must be of type resource, bool given in /var/www1/demos/online/index.php:6 Stack trace: #0 /var/www1/demos/online/index.php(6): fwrite() #1 {main} thrown in /var/www1/demos/online/index.php on line 6