Warning: Undefined variable $linkconn in /var/www/html/Buchhandel/ImageUploader/uploads/Bestand_Ebay_Versuch2.php on line 7

Fatal error: Uncaught TypeError: mysqli_query(): Argument #1 ($mysql) must be of type mysqli, null given in /var/www/html/Buchhandel/ImageUploader/uploads/Bestand_Ebay_Versuch2.php:7 Stack trace: #0 /var/www/html/Buchhandel/ImageUploader/uploads/Bestand_Ebay_Versuch2.php(7): mysqli_query() #1 {main} thrown in /var/www/html/Buchhandel/ImageUploader/uploads/Bestand_Ebay_Versuch2.php on line 7