我正尝试连接到MySQL并将数据填充到Dropdown。这是我的代码。某些原因下拉列表没有被填充。请建议。

这是代码。

$mysqli_connection = new mysqli($db_host, $db_username, $db_password, $db_database);

if (isset($_POST['Submit_1'])) {

require 'submit.php';

require 'validate.php';

if ($form_errors = validate_form()) {

show_form($form_errors);

}

else

{

form_submit_1();

}

}

else

{

show_form();

}

function show_form($errors = '')

{

// were there any errors?

if ($errors) {

//show errors

}

?>

$sql = "SELECT id, code FROM table1";

$result11 = $mysqli_connection->query($sql);

echo " ";

while ($row = $result11->fetch_assoc()) {

echo "$row[code]";

}

echo "";

?>

} // End of show_form()

?>