php class Cannot use object of type User as array

I have a user class to get all user data, I tried to show a particular user's email but have error with Fatal error: Cannot use object of type User as array in C:\..., please advise.


class User{

    public function get_user_info($user_id, $mysqli){
        if(empty($user_id)) {
            return null;

        $sql = $mysqli->query("SELECT * FROM `users` WHERE user_id='".$user_id."' LIMIT 1");

        if($sql->num_rows > 0){
            $row = $sql->fetch_array(MYSQLI_BOTH);
            return $row;

        return null;


call email:


$user = new User;
$user->get_user_info($user_id, $mysqli);

echo 'email: '.$user['user_email'];


$mysqli is never defined in your code.

You cannot use something that was not defined.

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