Access denied for user 'username'@'localhost' (using password: YES) in C:\webdev\wamp\www\membershipSite\classes\Mysql.php on line 9

Question

I'm new to all of this but I do know a decent amount of HTML/CSS. I want to create a login server and I got most of the code from a video. If someone could help me and explain thoroughly so I can understand it would be greatly appreciated. If any other stuff is needed I will gladly post it.

<?php

require_once 'includes/constants.php';

class Mysql {
private $conn;

function _construct() {
    $this->conn = new mysqli(DB_SERVER, DB_USER, DB_PASSWORD, DB_NAME) or die('There was a problem connecting to the database.');
}

function verify_Username_and_Pass($un, $pwd) {

    $query = "SELECT *
            FROM users
            WHERE username = ? AND password = ?
            LIMIT 1";

    if($stmt = $this->conn->prepare($query)) {
        $stmt->bind_param('ss', $un, $pwd);
        $stmt->execute();

        if($stmt->fetch()) {
            $stmt->close();
            return true;
        }
    }

}
}

Answer 1

You need to grant permissions to the user@host in mysql. The grant command looks like

grant all privileges on YOURDB.* to
'YOURUSER'@'localhost' identified by 'YOURPASSWORD';