I found not only "Versions before PHP 4.3.0 additionally require libsasl.dll.".If you use php-5.3.3-Win32-VC9-x86 or later Versions thatIt's require libsasl.dll.Running under Windows & Apache 2.2.8PHP file is download from http://windows.php.net/downloads/releases/archives/When I use php-5.2.x-Win32-VC6-x86 and php-5.3.x-Win32-VC6-x861.just uncomment extension=php_ldap.dll  in php.ini2.Restart apache,it's okWhen I use php-5.3.x-Win32-VC9-x86 and php-5.4.x-Win32-VC9-x861.just uncomment extension=php_ldap.dll  in php.ini2.Restart apache,always fail...(only php-5.3.1-Win32-VC9-x86 & php-5.3.2-Win32-VC9-x86 is ok. )[php-5.3.3-Win32-VC9-x86 or later Versions]1.just uncomment extension=php_ldap.dll  in php.ini2.copy  libsasl.dll to [apache folder]\bin3.Restart apache,it's ok

If using a debian machine (debian or ubuntu variants) just do apt-get install php5-ldap, that's all to get ldap work on php. No need to get sources, try to compiling them and  so on.

On newer versions of Windows and Windows Server, if you've installed PHP from the Microsoft Web Platform Installer (PI) then all you have to do is add extension=php_ldap.dll to the extensions section and restart IIS.

OCI client from Oracle distributes un ldap.h which may collision with the SO ldap.h.You can, remove the Oracle ldap.h and build or configure php without oci8 and then add OCI8 later as a shared extension.This latter step is easiest using PECL: pecl install oci8. You will then need to add 'extension=oci8.so' to your php.ini.