php ldap验证

<?php
$ldap_host = "ldap://ServerIP";//LDAP 服务器地址
$ldap_port = "389";//LDAP 服务器端口号

//用户名密码 RDN登录
$ldap_user = "mail=uid@mail.com;virtualDomain=mail.com;o=Account;dc=org";//设定登录DN
$ldap_pwd = "123456";//设定密码

$ldap_conn = ldap_connect($ldap_host, $ldap_port);//建立与 LDAP 服务器的连接

$set = ldap_set_option($ldap_conn, LDAP_OPT_PROTOCOL_VERSION, 3);    //设置参数，这个目前还不了解

if(!$ldap_conn)
{
    //诊断连接错误
    die("Can't connect to LDAP server");
}
ldap_bind($ldap_conn, $ldap_user, $ldap_pwd) or die("Can't bind to LDAP server.");//与服务器绑定
/*var_dump($ldap_conn);
exit;*/

//连接成功
if(ldap_errno($ldap_conn)!=0)
{
  echo "Can't log in! ".ldap_error($ldap_conn)."<br>";
}
else
{
  echo "Welcome $ldap_user";
}
ldap_unbind($ldap_conn) or die("Can't unbind from LDAP server."); //与服务器断开连接
?>

LDAP：DN与RDN链接 Appendix A - LDAP: DN & RDN