Connessione a server LDAPS con certificato autogenerato

$adUsername = 'UTENTE_LDAP';
$adPassword = 'PASS_LDAP';

$adServer = 'ldaps://IP_SERVER_LDAP';
$adPort = 636;

$adsuffix = '@EVENTUALE_SUFFISSO';

$ldap = ldap_connect($adServer, $adPort);
if (!$ldap)
die("NO CONNECT");

$ldaprdn = $adUsername.$adsuffix;

ldap_set_option($ldap, LDAP_OPT_PROTOCOL_VERSION, 3);
ldap_set_option($ldap, LDAP_OPT_REFERRALS, 0);
//ldap_set_option(NULL, LDAP_OPT_DEBUG_LEVEL, 7);//aumento il verbose dei log
ldap_set_option($ldap, LDAP_OPT_DIAGNOSTIC_MESSAGE, 0x0032);//visualizza messaggi errore bind
$bind = ldap_bind($ldap, $ldaprdn, $adPassword);
if (!$bind) {
echo ldap_err2str(ldap_errno($ldap));
echo "\nNo BIND\n";
exit;
}else{
echo "\nConnesso con $adUsername $adPassword\n";
}