Warning: Undefined array key 1 in C:\xampp\htdocs\index.php on line 9

Fatal error: Uncaught TypeError: mktime(): Argument #1 ($hour) must be of type int, string given in C:\xampp\htdocs\index.php:16 Stack trace: #0 C:\xampp\htdocs\index.php(16): mktime('', '', '', '', '', '') #1 {main} thrown in C:\xampp\htdocs\index.php on line 16