$ldaphost = "dc.mydomain.com";       // your ldap server
$ldapport = 389;                 // your ldap server's port number
$ldapuser = "username@mydomain.com";
$ldappass = "somepass";
$basedn = 'dc=mydomain,dc=com';

$searchfor = 'seconduser';

//Connecting to LDAP
$ldapconn = ldap_connect($ldaphost, $ldapport) or die("Could not connect to" . $ldaphost);

if ($ldapconn)
{

  ldap_set_option($ldapconn, LDAP_OPT_PROTOCOL_VERSION, 3);
  ldap_set_option($ldapconn, LDAP_OPT_REFERRALS, 0);

    // binding to ldap server
    $ldapbind = ldap_bind($ldapconn,$ldapuser, $ldappass);

  $filter = '(&(samaccounttype=805306368)(samaccountname=' . $searchfor . '))';

  $result = ldap_search($ldapconn, $basedn, $filter, array('samaccountname'));

  $info = ldap_get_entries($ldapconn, $result);

  echo '<pre>';
  print_r($info);

}

$ldapbind = ldap_bind($ldapconn,$ldapuser, $ldappass);

$ldapbind = ldap_bind($ldapconn);

ldap_search(): Search: Operations error