dbConnecterController.php

<?php
namespace App\Controller;
use PDO;

class dbConnecterController {
    public function __construct(){
    }

    public  function validate(){
        $username = $_POST['username'];
        $password = $_POST['password'];

        $host = "localhost";
        $user = "root";
        $pass = "";
        //$pass = "toor";
        $dbname = "MyGalleryDb";
        //$dbname = "mygallerydb";


        // Handle a bit of connection errors
        try {
            // Connect to server via PHP Data Object
            $dbconnection = new PDO('mysql:host='.$host.';dbname=' . $dbname, $user, $pass);



        } catch (PDOException $e) {
            echo htmlentities($e);
            die();
            echo "FAIL!";
        }

            $result = $dbconnection->query('SELECT * FROM users WHERE username="'.$username.'" && password ="'.$password.'";');
            $result->setFetchMode(PDO::FETCH_ASSOC);
            //$row = $result->fetch();

            if ($username && $password) {
                $row = $result->fetchColumn();
                if($row != 0){
                    while ($result->fetchColumn) {
                        $usernameDb = $info['username'];
                        $passwordDb = $info['password'];

                        if ($username == $usernameDb && $password == $passwordDb) {
                            header('Location: gallery.php');
                            $_SESSION['username'] = $usernameDb;
                        } else {
                            die("You messed up maaan... Check your username or password.");
                        }
                    }
                } else {
                    die("Username not in the DB, talk with the owner to add you!");
                }
            }
        }
    }
?>