Fatal error: Uncaught ValueError: mb_http_input(): Argument #1 ($type) must be one of "G", "P", "C", "S", "I", or "L" in /var/www/html/book.php:5 Stack trace: #0 /var/www/html/book.php(5): mb_http_input('UTF-8') #1 {main} thrown in /var/www/html/book.php on line 5