Warning: Undefined variable $conn in C:\xampp\htdocs\news_details.php on line 10

Fatal error: Uncaught TypeError: mysqli_real_escape_string(): Argument #1 ($mysql) must be of type mysqli, null given in C:\xampp\htdocs\news_details.php:10 Stack trace: #0 C:\xampp\htdocs\news_details.php(10): mysqli_real_escape_string(NULL, '1') #1 {main} thrown in C:\xampp\htdocs\news_details.php on line 10