mssql connect to php:Call to undefined function mssql_connect()

[newphpbees]

Actually, now I only test my webpage in a computer that I create as a server. And also I’m not too familiar in a server. Now I created a database in SQL Server 2005 Express and some of information I will share is:

I used:
SQL Server 2005 Express
IIS 6.0
Php 5.2.14

Server Type: Database Engine
Server name: ComputerName\SQLEXPRESS
Authentication: Windows Authentication
Username: NETBIOS NAME\Administrator [hide]
Password: [hide]

My problem is I cannot connect to my database using php and I don't know what username and password I should use if the Username: NETBIOS NAME\Administrator Password: [no password]

This is my php code:

<?php
//session_start(); 
//session_regenerate_id(); 

//if($_SESSION['loggedin']){ 
//the user is already logged in, lets redirect them to the other page 
  //  header("Location:company.php"); 
//} 


$server = "Computer Name\SQLEXPRESS";
$user = "NETBIOS\Administrator";
$pass = "";
$db_name="dbase"; 

//connection to database
$dbhandle = mssql_connect($server, $user, $pass) or die ("Cannot connect to Server");

//mssql_connect($server, 'sa', 'pass') or die("Cannot connect to server"); 
$selected = mssql_select_db($db_name, $dbhandle)or die("Cannot select DB");    


        $department = $_POST['department'];    
        $username = $_POST['username']; 

        $sql=mssql_query("SELECT `Department`, `Username` FROM `tbl_user` WHERE `Department` = '{$department}' AND Username = '{$username}'") or die(mssql_min_error_severity()); 
        $ct = mssql_num_rows($sql); 
      
        if($ct == 1) { 
// im guessing this means that the user is valid. 
$_SESSION['loggedin'] = true; // now that the user is valid we change the session value. 
            $row = mssql_fetch_assoc($sql);   
            
            //$_SESSION['username'] = $row['Username'] ;
            //$_SESSION['department'] = $row['Department'];
            
            $Departments=array('Accounting', 'Engineering', 'Finishing_Goods', 'HRAD', 'MIS', 'Packaging_and_Design', 'Production', 'Purchasing_Logistic', 'QA_and_Technical', 'Supply_Chain');
            
            if (in_array($row['Department'], $Departments)){
                    header ('Location:company.php');
            }else{
                    echo "Incorrect Username or Department";
                    header ('Location:index.php');
            }
        }
?>

I don't know if what configuration i need to do to work my connection. I configured php.ini like:

I uncommented the following:

extension_dir = "C:\php\ext"
extension=php_sqlsrv_52_ts_vc6.dll
extension=php_bz2.dll
extension=php_curl.dll
extension=php_dba.dll
extension=php_exif.dll
extension=php_gd2.dll
extension=php_gettext.dll

mssql.allow_persistent=On
mssql.max_persistent=-1
mssql_max_links=-1
mssql.min_error_severity=10
mssql.compatibility_mode=Off
mssql.connect_timeout=5
mssql.timeout=60
mssql.textlimit=4096
mssql.textsize=4096
mssql.batchsize=0
mssql.datetimeconvert=On
mssql.secure_connetion=Off

FreeTDS default to 4096
mssql.max_procs=25
mssql.charset = "ISO-8859-1"

After I commented out that in php.ini, I put all sqlsrv file in C:\php\ext and the ntwdlib.dll into C:\WINDOWS\system32. After that still when I run my webpage the error is still there. I have no idea how I can fix that error.


Error:
Fatal error: call to undefined function mssql_connect() in C:\Inetpub\wwwroot\web_intranet\index.php on line 17

I hope somebody can help or tell me what I should do.
Thank you