PHP LDAP Search Root of Active Directory

Using PHP to query Active Directory resulted in a few problems e.g.

Warning: ldap_search() [function.ldap-search]: Search: Can’t contact LDAP server in …

ldap_search(): Search: Operations error
Warning: ldap_search() [function.ldap-search]: Search: Partial results and referral received

The errors only appeared when trying a search from the AD root, the errors disappeared when the search was carried out on an OU.

To solve these problems the following 2 lines are needed between the connection and the bind. The location is important !

ldap_set_option ($ldap_connection, LDAP_OPT_REFERRALS, 0);
ldap_set_option($ldap_connection, LDAP_OPT_PROTOCOL_VERSION, 3);

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