PHP cannot anonymously bind to LDAP - php

Question

Problem is that I can connect LDAP through PHP but I cannot bind to it.
In Apache Directory Studio I can connect and bind without any problem but in PHP result is always "FAIL".
How to bind to LDAP with PHP?
<?php
$ldaphost = "ldaps://server.net";
$ldapport = 636;
$ldapconn = ldap_connect($ldaphost, $ldapport);
if($ldapconn){
echo 'Connected';
$ldapbind = ldap_bind($ldapconn);
if($ldapbind){
echo "OK";
} else {
echo "FAIL";
}
}

Answer 1

Try to set the protocol version
<?php
// Anonymous connection
$ldaphost = "ldaps://server.net";
$ldapport = 636;
$ldapconn = ldap_connect($ldaphost, $ldapport)
or die("Cannot connect to LDAP server.");
if ($ldapconn) {
echo 'Connected';
// set protocol version
ldap_set_option($ldapconn, LDAP_OPT_PROTOCOL_VERSION, 3);
// anonymous identification
$ldapbind = ldap_bind($ldapconn);
if ($ldapbind) {
echo 'OK';
} else {
echo 'FAIL';
}
}
?>