ldap_search timeout?

[Max]

Hi,

I've got a web GUI in which users can add server IP, ldap base,
username, password to enable connectivity to Active Directory.
Everything works great in the connection, etc. However, if the user
adds the wrong ldap base/filter parameters (which is easy to do), the
LDAP_SEARCH function will hang for the longest time before it times out
and releases the UI. I've tried the following two documented methods to
make the timeout period 3 seconds, but neither effects the long timeout
period at all! Is this a bug or am I doing something wrong?

ldap_set_option($ldap, LDAP_OPT_TIMELIMIT,3);

$result = ldap_search($ldap, $ldapbase,
"userPrincipalName=*",array("cn"),0,0,3,LDAP_DEREF _NEVER);

Anybody know of a way I can get this to work?

Thanks,
Max