Correction for my previous post:
php -m
PHP Warning:  PHP Startup: Unable to load dynamic library '/usr/local/php/lib/php/extensions/ldap.so' - /usr/local/php/lib/php/extensions/ldap.so: undefined symbol: third_arg_force_ref in Unknown on line 0

Please try using this CVS snapshot:

  http://snaps.php.net/php5.3-latest.tar.gz
 
For Windows (zip):
 
  http://snaps.php.net/win32/php5.3-win32-latest.zip

For Windows (installer):

  http://snaps.php.net/win32/php5.3-win32-installer-latest.msi

Hello, with a new checkout it works fine for me.

Hi,
problem still remains.
Compiled PHP from source http://snaps.php.net/php5.3-latest.tar.gz

php -m
PHP Warning:  PHP Startup: Unable to load dynamic library '/usr/local/php/lib/php/extensions/ldap.so' - /usr/local/php/lib/php/extensions/ldap.so: undefined symbol: third_arg_force_ref in Unknown on line 0
[PHP Modules]
calendar
ctype
date
dom
ereg
filter
hash
iconv
json
libxml
openssl
pcntl
pcre
PDO
pdo_sqlite
posix
Reflection
session
SimpleXML
sockets
SPL
SQLite
standard
sysvmsg
sysvsem
sysvshm
tokenizer
xml
xmlreader
xmlwriter
zlib

[Zend Modules]


In PHP 5.2.5 everything works fine.

Regards 
Petr

Odd... Compile with success here.

I've found that this problem occures only if LDAP extension is compiled externaly using phpize.
If it's compiled together with php core using general configure script,
extension works fine.
I don't know where might be a problem.

Petr

Did you 'make install' before re-phpizing the ldap module? And why do do you phpize ldap anyway, it's stock extension, just build it as static into the PHP..

'make install' of what?
I usualy build and install PHP core from source 
using configure, make, make install
and than I externaly compile only usable extensions found in ext directory or from pecl source using phpize, configure, make, make install.
Rebuilding fixed extensions separately It's faster for me then rebuild the whole source tree.

Regards
Petr

So you're doing something we don't support and never will. If you want to build shared extensions, use the proper configure options. phpize is not meant for building extension under ext/ directory.