public function set__password($passwd) {
    self::$password = password_hash($passwd, PASSWORD_BCRYPT, array('cost' => 12));
}

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$username = $_POST['username'];
$password = $_POST['password'];

$DB = Database::getInstance();

// Get the stored password hash
$res = $DB->run__query('SELECT password FROM users WHERE username = "' . $username . '"');
$hash = $res[0]['password'];


// Do the passwords match?
if(password_verify($password, $hash)) {
    echo 'success';
} else {
    echo 'failed';
}

if(isset($_POST['submit'])){
    include 'database.php';
$uid = mysqli_real_escape_string($conn,$_POST['uid']);
$pass = mysqli_real_escape_string($conn,$_POST['pass']);

$query = "SELECT * FROM user WHERE username ='$uid'";
$tbl = mysqli_query($conn, $query);
if (mysqli_num_rows($tbl)>0){

    $row = mysqli_fetch_array($tbl, MYSQLI_ASSOC);
    $hash = $row['password'];
     if (password_verify($pass, $hash)){
         echo "success";
     }
     else {
         echo "log in error";
     }

}
}