Warning: Undefined array key "blacklist" in C:\Apache24\htdocs\inventory\vendor_blacklist.php on line 2

Warning: Undefined variable $pdo in C:\Apache24\htdocs\inventory\vendor_blacklist.php on line 6

Fatal error: Uncaught Error: Call to a member function query() on null in C:\Apache24\htdocs\inventory\vendor_blacklist.php:6 Stack trace: #0 {main} thrown in C:\Apache24\htdocs\inventory\vendor_blacklist.php on line 6