$hostname="ldap://sub.domain.com";
$ds=ldap_connect($hostname,389);
ldap_set_option ($ds,LDAP_OPT_REFERRALS,0) or die('Unable to set LDAP opt referrals');
ldap_set_option($ds,LDAP_OPT_PROTOCOL_VERSION,3) or die('Unable to set LDAP protocol version');

if ($ds)
{
$dn = "OU=Users,OU=ro,DC=sub,DC=domain,DC=com";

if (!($ldapc=ldap_bind($ds))) { 
    echo "<p>Error:" . ldap_error($ds) . "</p>"; 
    echo "<p>Error number:" . ldap_errno($ds) . "</p>"; 
    echo "<p>Error:" . ldap_err2str(ldap_errno($ds)) . "</p>"; 
    die;
} 

$attributes = array("sn");
$filter = "(sn=*)";
$result = ldap_search($ds,$dn,$filter,$attributes);

echo $result;
$info = ldap_get_entries($ds,$result);
for ($i=0; $i < $info["count"]; $i++) {
    echo $info[$i]["ou"][0];
}
} else {
    echo "<h4>Unable to connect to LDAP server</h4>";
}

ldap_unbind($ds);

ldap任何匿名连接的工作原理是因为我在AD浏览器中测试,一切都很好.
在这段代码中,它停止在

ldap_search($ds,$attributes);

我收到警告：

Warning: ldap_search(): Search: Operations error in ..\index.PHP on line 38

我真的不知道这个错误的原因是什么,我感谢你的帮助.