<?php
$connect = mysql_connect("localhost","root","");
$database = mysql_select_db(asd);
$name = $_POST['_username'];
$password = $_POST['_password'];
if(isset($_POST["search"]))
                             {
$sel = "SELECT * FROM s WHERE a='".$name."' AND ab='".$password."'";
$query = mysql_query($sel);

$row = mysql_fetch_array($query);

if($row["a"]==$name && $row["ab"]==$password)
{
echo "Welcome";
}
else
{
echo"Your password is wrong";
}
                            }
echo "<form action='#' method='post'>
         username: <input type='text' name='_username'  /><br>
         password: <input type='text' name='_password' /><br>
  <input type='submit' value='Search' name='search' /> </form>";
 
?>