php+ldap问题请教

cnbird

<?php
$ds = ldap_connect("10.255.x.x:10636");
$test = array('userPassword');
$uid = cnbird;
$r = ldap_bind($ds, "cn=useradmin,ou=SiteMinder,ou=accounts,ou=test,o=PWGroup,c=CN", "password");
$useresult = ldap_search($ds, "ou=people,ou=internal,ou=test,o=PWGroup,c=CN", "(uid=$uid)", $test);
$info = ldap_get_entries($ds, $useresult);
print_r($info);

?>

得到结果

Array ( [count] => 1 [0] => Array ( [uid] => Array ( [count] => 1 [0] => cnbird ) [0] => uid [count] => 1 [dn] => uid=cnbird,ou=people,ou=internal,ou=test, o=PWGroup,c=CN )





请问如何获得到userPassword这个属性,或者其他的相关属性,我是不是filter写错了