Ajax İle Veri Post Etme

include 'baglan.php';

extract($_POST);
if($_POST){

$uyesor=$db->prepare("SELECT * FROM urunler WHERE urun_barkod = :urun_barkod");
$uyesor->execute(array(
'urun_barkod' => $urun_barkod
));
$speturn=$uyesor->fetch(PDO::FETCH_ASSOC);
$say=$uyesor->rowCount();



if ($say > 0) {

$gonder = $db->prepare("INSERT INTO sepet SET
kisi_id = :kisi_id,
urun_id = :urun_id,
urun_fiyat = :urun_fiyat,
urun_sub = :urun_sub");
$insert = $gonder->execute(array(
"kisi_id" => $idasd,
"urun_id" => $speturn['id'],
"urun_fiyat" => $speturn['urun_fiyat'],
"urun_sub" => 1,
));


}

}

ini_set('display_errors', '1');ini_set('display_startup_errors', '1');error_reporting(E_ALL);

ini_set('display_errors', '1');ini_set('display_startup_errors', '1');error_reporting(E_ALL);

[20-Aug-2020 15:03:13 UTC] PHP Fatal error:  Uncaught Error: Call to a member function prepare() on null in /home/lenvojbq/sub/barkod/urun-sat-sorgu.php:8
Stack trace:
#0 {main}
thrown in /home/lenvojbq/sub/barkod/urun-sat-sorgu.php on line 8

print_r($gonder->errorInfo());

print_r($uye->errorInfo());

"urun_sub" => 1,