<?php
    $username = $_POST["username"];
    $password = $_POST["password"];
    $con = mysql_connect("localhost","test","");
    mysql_select_db("test", $con);
    $result = mysql_query("SELECT * FROM login WHERE username = '$username'");

    if(mysql_num_rows($result) < 1)
    {
        mysql_query("INSERT INTO login (username, password)
        VALUES ('$username', '$password')");
        echo "0";
        echo $username;
    }
    else
    {
        echo "1" + mysql_query("SELECT COUNT(username) FROM login
    WHERE username = '$username'");
    }

?>