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';

Answer 2

Just a side answer as i came to this answer from my own problem but had a different solution as i knew all privileges were given to the user in question

I was using code such as

        <?php

        session_start();

        $db_host="host";
        $db_user="user";
        $db_pass="mypassword";
        $db_name="dbname";
        $db_table="tblname";

        mysql_connect($db_host, $db_user, $db_pass) or die(mysql_error());
        mysql_select_db($db_name) or die(mysql_error());

The problem here was that the database password that i had used a generator for included a $ symbol which confused the script and thought there was another variable in starting in

        $db_pass="mypass$word";