Warning: Undefined array key "HTTP_REFERER" in C:\xampp\htdocs\ce\santana\lib\config.php on line 12

Fatal error: Uncaught ValueError: strrpos(): Argument #3 ($offset) must be contained in argument #1 ($haystack) in C:\xampp\htdocs\ce\santana\lib\config.php:14 Stack trace: #0 C:\xampp\htdocs\ce\santana\lib\config.php(14): strrpos('', '/', -1) #1 C:\xampp\htdocs\ce\santana\inc\init.php(3): require_once('C:\\xampp\\htdocs...') #2 C:\xampp\htdocs\ce\santana\autcnd.php(3): require_once('C:\\xampp\\htdocs...') #3 {main} thrown in C:\xampp\htdocs\ce\santana\lib\config.php on line 14