Using PHP & MySQL to populate dropdown

Question

I am trying to populate a second dropdown list using the value selected from a first dropdown list using PHP and MySQL, and without refresh

Answer 1

Like other members have says, you should use PDO (with prepared statements) instead of mysql_.

One possible implementation:

HTML (form.php)

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PHP (get_list2.php)

require_once("config.php");

$id = $_GET['id'];

if (!isset($id) || !is_numeric($id))
    $reponse = array('success' => FALSE);
else {
    // Where $db is a instance of PDO

    $query = $db->prepare("SELECT * FROM mytable WHERE id = :id");
    $query->execute(array(':id' => $id));
    $rows = $query->fetchAll(PDO::FETCH_ASSOC);

    $options = "";
    foreach ($rows as $row) {
        $options .= ''. $row .'';
    }

    $response = array(
        'success' => TRUE,
        'options' => $options
    );
}

header('Content-Type: application/json');
echo json_encode($response);

PS : not tested but it should works... I guess.