For debugging ldap connectivity issues in php

ldap_debug_2.php

<?php

$ldap="host.domain.tld";
$usr="user@domain.tld";
$pwd = 'userpassword';

$debug = true;
// Set debugging
if ($debug) {
  ldap_set_option(NULL, LDAP_OPT_DEBUG_LEVEL, 7);
}

$ds=ldap_connect($ldap);
$ldapbind=false;
if(ldap_set_option($ds, LDAP_OPT_PROTOCOL_VERSION, 3))
  if(ldap_set_option($ds, LDAP_OPT_REFERRALS, 0))
    if(ldap_start_tls($ds))
      $ldapbind = @ldap_bind($ds, $usr, $pwd);

ldap_close($ds);

if(!$ldapbind)
  echo "ERROR";
else
  echo "OK";
?>