auth.php

<?php
/**
 * Created by PhpStorm.
 * User: root
 * Date: 31/03/16
 * Time: 00:38
 */

require "../ConfigDB/DBenv.php";
class Auth
{

    private $username;
    private $password;
    private $email;


    /**
     *
     */
    public function register()
    {
        $this->username = $_POST['Username'];
        $this->password = $_POST['Password'];
        $this->email = $_POST['Email'];


        echo $this->username;
        echo $this->password;
        echo $this->email;

        $this->username = mysql_real_escape_string($this->username);
        $this->password = mysql_real_escape_string($this->password);
        $mysql = "SELECT * FROM Users WHERE username = $this->username";
        $query = Mysql_query($mysql);

        $count = mysql_num_rows($query);

        if($count==0){
            echo "you can register";
            $this->insert();

        }else{

            echo"you are allready registerd";
        }
    }

    public function insert(){

        if(mysql_query("INSERT INTO Users ('Username', 'Password', 'Email')VALUES ('$this->username', '$this->password', '$this->email')")){

           echo "registerd";
        }
        else
        {

       echo "not registerd";
        }
    }

/*close class Auth*/
}

$obj = new Auth();

var_dump($obj);

if(isset($_POST['Register']))
{
    $obj->register();

}