Warning: Undefined variable $conn in /home/hossunbbsr/public_html/media.php on line 7

Fatal error: Uncaught TypeError: mysqli_query(): Argument #1 ($mysql) must be of type mysqli, null given in /home/hossunbbsr/public_html/media.php:7 Stack trace: #0 /home/hossunbbsr/public_html/media.php(7): mysqli_query(NULL, 'SELECT * FROM m...') #1 {main} thrown in /home/hossunbbsr/public_html/media.php on line 7