Fatal error: Uncaught TypeError: mysqli_query(): Argument #1 ($mysql) must be of type mysqli, PDO given in /home/ailem/public_html/ayar.php:17 Stack trace: #0 /home/ailem/public_html/ayar.php(17): mysqli_query(Object(PDO), 'SET NAMES utf8') #1 /home/ailem/public_html/index.php(4): include('/home/ailem/pub...') #2 {main} thrown in /home/ailem/public_html/ayar.php on line 17