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At this stage I think it's important to mention that among all the problem related to the php_sybase_ct.dll that couldn't be loaded letting you unable to connect to sybase databases via PHP here's where can be the villain. If you don't fail into this, Bravo and you deserve all my respect. I just needed to reinstall PHP with an installer that includes php_sybase_ct.dll, so no need to copy it from somewhere else to the extensions directory. To be more clear I first installed this package php-5.3.2-nts-Win32-VC9-x86.msi which doesn't come with the dll and used instead php-5.3.2-nts-Win32-VC6-x86.msi which comes from http://windows.php.net/download.
The following tool really helped me to find the solution : http://www.dependencywalker.com/, by telling me that php_sybase_ct.dll was missing a specific PHP dll which couldn't be found in the package I installed in the first stage.
Moreover, you have to make sure that you have a proper Sybase client installed with the precious libct.dll. I run Windows 2003 Server - IIS6 - PHP 5.3.2 - OCS-12_5
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