I have downloaded 'Collection of PECL modules' for PHP. It contains php_ldap.dll, but not php_openssl.dll file. It is important to use php_openssl.dll if I do not use ssl?
If you aren't using SSL, you probably don't need the dll; however, make sure you define the encryption as follows:
$wgLDAPEncryptionType = array( "domain"=>"clear" );
otherwise you'll be using TLS, which will cause a crash.
Also notice that I may be detecting php_ldap improperly. If binding is working, you can probably ignore that error. Fixing the detection is on my todo.
V/r,
Ryan Lane