query("SELECT miqdor FROM qarzdorlar WHERE id = $id");
$existing_money = $existing_money->fetch_assoc()["miqdor"];
if (array_key_exists("miqdor", $_POST) && $existing_money >= $_POST["miqdor"]) {
$miqdor = (int) $existing_money - $_POST["miqdor"];
$sql = "UPDATE qarzdorlar SET miqdor = $miqdor WHERE id = $id";
$result = $conn->query($sql);
if ($result === TRUE) {
header("Location: index.php");
} else {
echo "Error: " . $sql . "
" . $conn->error;
}
} elseif (array_key_exists("miqdor", $_POST) && $existing_money <= $_POST["miqdor"]) {
header("Location: index.php");
}
?>