PHP ถามวิธีการเขียนเว็บเพื่อตรวจสอบชื่อ User ใน Active Directory (AD) ครับ

<?
$host = "xxxxxxxxxxxxxxxxx";
$port = "389";
$dn = 'administrator';
$pass = 'xxxxxxxxxxxxxxxxxx';
$basedns = "@xxxxxxxxxxxxxxxx";
$base = "ou=department,ou=company,dc=domain,dc=com";
$scope = "sub";
$filter = "sAMAccountName=*";
echo "<h3>LDAP query test</h3>\n";
echo "Connecting ...\n";
$ds=ldap_connect($host, $port);
echo "connect result is " . $ds . "<br>\n";
ldap_set_option($ds, LDAP_OPT_PROTOCOL_VERSION,3);
ldap_set_option($ds, LDAP_OPT_REFERRALS,0);
if ($ds) {
   echo "Binding ...\n";
	if (!ldap_set_option($ds, LDAP_OPT_PROTOCOL_VERSION, 3)) {
		echo "Failed to setup LDAP protocol to 3 - Start TLS not support\n";
		exit;
	}
   $r=ldap_bind($ds, $dn.$basedns, $pass);
   echo "Bind result is " . $r . "<br>\n";
   echo "Searching for $filter ...";
   $sr=ldap_search($ds, $base, "($filter)"); 
   echo "Search result is " . $sr . "<br>\n";
   echo "Number of entires returned is " . ldap_count_entries($ds, $sr) . "<br>\n";
   echo "Getting entries ...<p>\n";
   $info = ldap_get_entries($ds, $sr);
   echo "Data for " . $info["count"] . " items returned:<p>\n";
   for ($i=0; $i<$info["count"]; $i++) {
       echo "DN : " . $info[$i]["dn"] . "<br>\n";
	  echo "User Name : " . $info[$i]["samaccountname"][0] . "<br>\n";
       echo "Display Name : " . $info[$i]["givenname"][0] . "&nbsp;". $info[$i]["sn"][0] ."<br>\n";
	  echo "Description : " . $info[$i]["description"][0] . "<br>\n";
	  echo "Office : " . $info[$i]["physicaldeliveryofficename"][0] . "<br>\n";
	echo "Phone Number : " . $info[$i]["telephonenumber"][0] . "<br>\n";
       echo "E-Mail: " . $info[$i]["mail"][0] . "<br><hr>\n\n";
   }
   echo "Closing connection\n";
   ldap_close($ds);
} else {
   echo "<h4>Unable to connect to LDAP server</h4>";
}
?>