Support LDAP_OPT_DIAGNOSTIC_MESSAGE

[datatim]

Add a new piece of functionality to support retrieving extended LDAP diagnostic messages.

$adldap->getConnection()->setExtendedErrors();
$result = $adldap->user()->create($attributes);

if (!$result) {
     $error = $adldap->getLastError();
     echo "There was an error adding a user: " . $error->getDiagnosticMessage();
}