php session_start db mysql_connect localhost root mysql_select_db rpgg

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<?php
session_start();
$db = mysql_connect("localhost", "root", "");
mysql_select_db("rpggg");
if(isset($_POST['button']))
{
$login = $_POST['login'];
$password = $_POST['password'];
}
$query = mysql_query("SELECT * from user WHERE name='$login'");
$mydb = mysql_fetch_array($query);
if ($login == $mydb['name'])
{
if ($password == $mydb['password'])
{
$_SESSION['login'] = $login;
echo "Ник: $login";
}
else
{
echo "Пароль введен не верно!";
}
}
else
{
echo "Логин веден не верно";
}
?>