if($_SERVER["REQUEST_METHOD"] == "POST"){

    if(empty(trim($_POST["username"]))){
        $username_err = 'Please enter username.';
    } else{
        $username = trim($_POST["username"]);
    }

    // Check if password is empty
    if(empty(trim($_POST['password']))){
        $password_err = 'Please enter your password.';
    } else{
        $password = trim($_POST['password']);
    }
    #echo $username;
    #echo $password;
    $sql = "SELECT username, password, failed_logins FROM users WHERE username = $username";
    $row = mysqli_query($link, $sql);
    echo $row;


    // Close connection
    mysqli_close($link);
}
?>