`<?php
$username = $_POST['user'];
$password = $_POST['pass'];



//connect to the server
mysql_connect("localhost","root","");
mysql_select_db("users");


//query

$result = mysql_query("select*from users where username = '$username' and password ='$password'")
or die ("failed to query".mysql_error());
$row =mysql_fetch_array($result);
if($row['username']==$username && $row['password']==$password)
{
    echo "login success!!! welcome". $row['username'];
}
else
{
    echo "failed to login";
}
?>`