How do I use fetchAll in php?

Question

I am using this statement to fetch the elements in a column in my db

$result = $stmt->fetchAll(PDO::FETCH_COLUMN, 0);

but I get this error when trying to run it.

Call to undefined method mysqli_stmt::fetchAll();

Is there something I need to add to my php file to include that method or something?

UPDATE 1:

class LoginAPI
{
private $db;

function __construct() 
{
    $this->db = new mysqli('xxx', 'xxx', 'xxx', 'xxx');
    $this->db->autocommit(FALSE);
}

function __destruct() 
{
    $this->db->close();
}

function login() 
{
    if(isset($_POST["lang"]))
    {
        $stmt = $this->db->prepare("SELECT code FROM locations");
        $stmt->execute();
        $stmt->bind_result($code);

        //while($stmt->fetch())
        //{
        //  result[] = "code"=>$code;
        //  break;
        //}
        $codeArr = array();
        $result = $stmt->fetch_all();//|PDO::FETCH_GROUP;




        sendResponse(200, json_encode($result));
        return true;
    }
    sendResponse(400, 'Invalid Request');
    return false;
}
}

Answer 1

You're using mysqli, and you've got a statement not a result. If you have a mysqli_result you could be using the method fetch_all().

However, as this is a mysqli_stmt, you first need to execute and then use fetch_all() on the result set. See below example

 $stmt = $this->db->prepare("SELECT code FROM locations");
 $stmt->execute();


//grab a result set
$resultSet = $stmt->get_result();

//pull all results as an associative array
$result = $resultSet->fetch_all();

Note: with fetch_all you don't need to bind the result as your original code.