PHP LDAP (AD) Search for members of nested groups

Question

I'm looking for an possibility to check, if a user is a member of a group or not. The problem ... the group can be nested.

Example: Group_A is member of Master_Group Group_B is member of Master_Group User_A is member of Group_A

I've to check, if User_A is member of Master_Group (or nested Groups).

$result = ldap_search($ldap, $_GLOBAL["ldap_BaseDN"], "(????)");
$info = ldap_get_entries($ldap, $result);

Do I have to foreach through every group and check if there is a nested group?

Thank you in advance