<?php

$ldaprdn  = 'myusername';     // ldap rdn or dn
$ldappass = 'mypassword';

// connect to ldap server
$ldapconn = ldap_connect("LDAP://myDomain")
    or die("Could not connect to LDAP server.");

    ldap_set_option($ldapconn, LDAP_OPT_PROTOCOL_VERSION, 3);
    ldap_set_option($ldapconn, LDAP_OPT_REFERRALS, 0);
if ($ldapconn) {
var_dump(ldap_bind($ldapconn, $ldaprdn, $ldappass));

    if ($ldapbind) {
        echo "LDAP bind  successful...";
    } else {
        echo ldap_error($ldapconn);
        echo "LDAP bind  failed...";
    }

}

?>