SQLSTATE [HY000] [1698]拒绝访问用户'root'@'localhost'

Question

I just installed Ubuntu 16.04 and installed web server on it. Everything works well, but I cannot access database. Even if I create new user and grant all privileges, I can't create database In PHP I'm getting this error:

SQLSTATE[HY000] [1698] Access denied for user 'root'@'localhost'

When I try to login in terminal, it works, but in PHP and phpmyadmin don't.

PHP Code:

protected $host = '127.0.0.1';
protected $db = 'dbname';
protected $name = 'root';
protected $pass = 'root';
protected $conn;
private static $settings = array(
    PDO::MYSQL_ATTR_INIT_COMMAND => 'SET NAMES utf8'
);

public function __construct() {
    try {
        $this->conn = new PDO("mysql:host=$this->host;dbname=$this->db", $this->name, $this->pass, self::$settings);
    } catch (PDOException $e) {
        echo $e->getMessage();
    }
}

Answer 1

Users for mysql and for server are 2 different things, look how to add user to database and login with these credentials