Question

I’m creating an authentification file with php and mysql, but I have this mistake in this line:

$stmt2->bind_param('ss',$twitter_id, $name);

The error message is

Call to a member function bind_param() on a non-object in …

Where’s my mistake?

• $name in my database is a VARCHAR
• $twitter_id in my database is a VARCHAR
• $bd is my database connection

If a user is already registered, it should show me a message saying “User already registered”, and if the user isn’t registered, it should insert a new id and name in my database.

session_start();
if (!isset($_SESSION['userdata'])) {
    header("location: index.php");
} else {
    $userdata = $_SESSION['userdata'];
    $name = $userdata->name;
    $twitter_id = $userdata->id;
    $stmt = $bd->prepare("SELECT ID_TWITTER FROM USERS");
    $stmt->execute();                
    $stmt->bind_result($checkUser);
    if ($stmt->fetch()) {
    if($checkUser!==$twitter_id){
            $cSQL = "INSERT INTO USERS (ID_TWITTER, FULL_NAME) VALUES(?,?)";
            $stmt2 = $bd->prepare($cSQL);
            $stmt2->bind_param('ss',$twitter_id, $name);
            $stmt2->execute();
            $stmt2->close();
    } else {
        echo "User already exits";
    }
    }
    $stmt->close();
}

Answer 1

Solved : it works now

        $stmt = $bd->prepare("SELECT ID_PROVIDER FROM USERS WHERE ID_PROVIDER = ?");
        $stmt->bind_param('s', $twitter_id);
        $stmt->execute();
        $stmt->bind_result($checkUser);
        while ($stmt->fetch()) {
            $result = $checkUser;
        }
        if (empty($result)) {
            $cSQL = "INSERT INTO USERS (ID_TWITTER, FULL_NAME) 
           VALUES(?,?)";
            $stmt2 = $bd->prepare($cSQL);
            $stmt2->bind_param('ss', $twitter_id, $name);
            $stmt2->execute();
            $stmt2->close();
        }else {
    echo "User already exits";
}