Warning: Undefined variable $pdo in C:\inetpub\vhosts\buroyonetimi.com.tr\httpdocs\ders_icerik.php on line 21
Fatal error: Uncaught Error: Call to a member function query() on null in C:\inetpub\vhosts\buroyonetimi.com.tr\httpdocs\ders_icerik.php:21
Stack trace:
#0 {main}
thrown in C:\inetpub\vhosts\buroyonetimi.com.tr\httpdocs\ders_icerik.php on line 21