// deneme2.php
function baglan(){
$veritabani = "seninveritabanı";
$sunucu = "localhost";
$skadi = "root";
$spass = "xxx";
$baglanti = mysqli_connect($sunucu,$skadi,$spass);
mysqli_select_db($baglanti,$veritabani);
return $baglanti;
}
$kartnu = $_POST["kartnumara"];
$order = mysqli_query($baglan,"SELECT * FROM kartno WHERE kartnumara='$kartnu' LIMIT 1");
$result = mysqli_fetch_array($order);
echo "Kart Numarası: " . $result["kartnumara"] . "
Bakiye: " . $result["bakiye"];