seninki
$YoneticiSor = $VeritabaniBaglantisi->prepare("SELECT * FROM yoneticiler WHERE KullaniciAdi =: kullaniciad AND Sifre =: sifre");
yenisi
$YoneticiSor = $VeritabaniBaglantisi->prepare("SELECT * FROM yoneticiler WHERE KullaniciAdi = :kullaniciad AND Sifre = :sifre");