PHP and LDAP/Active Directory

<?php

putenv('LDAPTLS_REQCERT=never');

// putenv('TLS_CACERTDIR=/path-to-cert-dir');
// putenv('TLS_CACERT=/path-to-cert-dir/ca-cert.pem');

// ldap_set_option(NULL, LDAP_OPT_DEBUG_LEVEL, 7);

$handle = ldap_connect('ldap.forumsys.com');

// ldap_set_option($ds, LDAP_OPT_REFERRALS, 0);
// ldap_set_option($ds, LDAP_OPT_PROTOCOL_VERSION, 3);

$bind = ldap_bind($handle, 'uid=riemann,dc=example,dc=com', 'password');

if ($bind) {

    $search = ldap_search($handle, "dc=example,dc=com", "(objectClass=*)");
    $results = ldap_get_entries($handle, $search);

    foreach ($results as $index => $entry) {
        echo '<h1>' . $index . '</h1>';
        echo '<pre>' . print_r($entry, true) . '</pre>';
        echo '=======================';
    }

} else {

    echo 'failed to bind';

}