Pls help PHP/MYSQL

@RandellDawson
@PriyaMe
@Steffan153

Pls help, the below code is giving me error:

<?php
    // Get values passe from form in login.php file
    $username = $_POST['user'] = 'testuser';
    $password = $_POST['pass'] = "' or ''='";

    // to prevent mysql injection
    $username = stripcslashes($username);
    $password = stripcslashes($password);
    $username = mysqli_real_escape_string($connect, $_POST['user']);
    $password = mysqli_real_escape_string($connect, $_POST['pass']);
    $pass1 = mysqli_real_escape_string($connect, $_POST['pass1']);
    $email = mysqli_real_escape_string($connect, $_POST['email']);

    // connect to the server and select database
    mysqli_connect("localhost", "root", "");
    mysqli_select_db("login");

    // Query the database for user
    $result = mysql_query("select * from users where username = '$username' and password = '$password'")
                or die("Failed to query database ".mysql_error());
    $row = mysql_fetch_array($result);
    if ($row['username'] == $username && $row['password'] == $password){
        echo "Login success!!! Welcome ".$row['username'];
    } else {
        echo "Failed to login!";
    }

?>

Examine very carefully.
Trying to set a default value? Nope.