PHP authentication against Microsoft Active directory then returning users' group

We had the following script running a on redhat linux box w/php 4.x-apache 1.3.x authenicating a user against a NT4 domain controller which worked great until the recent upgrade to Active Directory. Not only does the script auth against the domain controller but if the user exists then this script determines which of the three groups the user is in. I have googled everywhere but not found much that is useful besides some ldap info which have posted the links to below our original script. I'm looking for a working script not a bunch of links, i'm not a pro with microsofts server stuff so a simple script that can do the same as our previous one would be great, thanks.

<?PHP
include("connect.php3");
function domainAuth($login, $pass){
            $primary_svr = "ufdc01.ad.ufl.edu";
            $domain = "UFAD";
            $group = "FRE";
            $authToNTDomain = validate($primary_svr, $domain, $group, $login, $pass);
            //echo "Class: authToNTDomain: $authToNTDomain<BR>";
            //echo smbauth_err2str($authToNTDomain) . "<BR>";
            if ($authToNTDomain == "0"  && $login != "" && $pass != "") {
                  return true;
                  //$this->authedToDomain = true;
                  //echo "this->authedToDomain = true<BR>";
            } else {
                  return false;
                  //$this->authedToDomain = false;
                  //echo "this->authedToDomain = false<BR>";
            }
}

function getGroup($login, $pass){
            $server = "ufdc01.ad.ufl.edu";
            $domain = "UFAD";
            $groups = getUserGroups($server, $domain, $login, $pass);

            //$err = err2str();
            //echo "error: $err<BR>";            
            $numItems = getNumItems($groups);
            $i = 0;
            while($i < $numItems){
                  $item = getItem($groups, $i);
                  //echo "$item<BR>";
                  $groupList[] = $item;
                  $i++;
            }
            
            $numGroups = count($groupList);
            for($g=0;$g < $numGroups;$g++){
                  //echo  "list: $groupList[$g] <BR>";
                  if ($groupList[$g] == "IF-FREDStaff"){
                        $group = "staff";
                        return $group;
                  } elseif ($groupList[$g] == "IF-FREDGrad"){
                        $group = "student";
                        return $group;
                  } elseif ($groupList[$g] == "IF-FREDFaculty"){
                        $group = "faculty";
                        return $group;
                  }
            }

            return false;

}


function inFRE($ID){
            $query = "SELECT * FROM directory WHERE username='$ID'";
            $result = mysql_query($query);
            if(mysql_num_rows($result) == 1 ) {
                  $located= mysql_num_rows($result);
                  $data = mysql_fetch_object($result);
            } else {
                  $query = "SELECT * FROM students WHERE ID='$ID'";
                  $result = mysql_query($query);
                  $located= mysql_num_rows($result);
                  $data = mysql_fetch_object($result);
            }

            if($located){
                  return true;
                  //$this->inFRE = true;
            } else {
                  return false;
                  //$this->inFRE = false;
            }
}




function hasBios($ID){
      $query = "SELECT * FROM directory WHERE username='$ID'";
            $result = mysql_query($query);
            if(mysql_num_rows($result) == 1 ) {
                  $data = mysql_fetch_object($result);
                  $type = $data->type;
            } else {
                  $query = "SELECT * FROM students WHERE ID='$ID'";
                  $result = mysql_query($query);
                  if(mysql_num_rows($result) == 1 ) {
                        $type = "Student";
                  }
            }      
                        

      if ($type == "Student"){
          $database = "student_bios";
      } elseif ($type == "Faculty"){
          $database = "faculty_bios";
      } elseif ($type == "Staff"){
          $database = "staff_bios";
      }

      $query = "SELECT bios_ID FROM $database WHERE bios_ID='$ID'";
      $result = mysql_query($query);
      $hasBios = mysql_num_rows($result);
      return $hasBios;
}


function createSession($login_user){
      global $HTTP_REFERER;
      session_id();
      session_start();
      $_SESSION["Username"] = "$login_user";
      $_SESSION["LoggedIn"] = 1;
      $sessionID = session_id();
      //SetCookie("sessionID", $sessionID);
      Header("Location: $HTTP_REFERER");
      return 1;
}


function isSupport($login, $pass){
                $server = "nt-pdc";
                $domain = "ifasdom";

                $groups = getUserGroups($server, $domain, $login, $pass);
                //$err = err2str();  
                //echo "error: $err<BR>";
                $numItems = getNumItems($groups);
                $i = 0;
                while($i < $numItems){
                        $item = getItem($groups, $i);
                        //echo "$item<BR>";
                        $groupList[] = $item;
                        $i++;
                }
                       
                $numGroups = count($groupList);
                for($g=0;$g < $numGroups;$g++){
                        //echo  "list: $groupList[$g] <BR>";
                        if ($groupList[$g] == "FREDSupport"){
                              return true;
                        //will return true and exit if found as support
                        }
                }
            // false if after looking through groupList array and not found as FREDSupport  
                return false;
}


?>

http://www.markround.com/ldap.html
http://www.developer.com/lang/php/article.php/3100951
https://www.experts-exchange.com/questions/21043386/Authentication-with-Active-Directory-in-PHP.html