<?php
$myServer = "localhost";
$myUser = "myuser";
$myPass = "password";
$myDB = "testdb";

//connection to the database
$dbhandle = mysql_connect($myServer, $myUser, $myPass)
or die("Couldn't connect to SQL Server on $myServer");

//select a database to work with
$selected = mysql_select_db($myDB, $dbhandle)
or die("Couldn't open database $myDB");

// The response variable
$res = "res=KO";

// Check incoming data
if ($_POST['name'] != "" && $_POST['pass'] != "") {

// Retrieve all rows from the "user_name" and "password" columns from the "account_info" table
$result = mysql_query("SELECT user_name, password FROM account_info")
or die(mysql_error());

//create a loop that continues until each row is called
while($row = mysql_fetch_array($result)) {

//check if client user name/password is the same as the row from database
if ($_POST['name'] == $row['user_name'] && $_POST['pass'] == $row['password']) {

// If they match, Ok, user found
$res = "res=OK";
break;
}

}

}

print $res;
?>