Warning: Undefined variable $query in C:\xampp\htdocs\binario\query.php on line 35

Fatal error: Uncaught ValueError: mysqli::query(): Argument #1 ($query) cannot be empty in C:\xampp\htdocs\binario\query.php:35 Stack trace: #0 C:\xampp\htdocs\binario\query.php(35): mysqli->query('') #1 {main} thrown in C:\xampp\htdocs\binario\query.php on line 35