PHP : __FILE__ problem with symbolics links and file path

Some time ago I have organized my wordpress plugins via symbolic links. It’s helped me to keep all plugins inside one repository dir and eases me to deploy plugins in different test wordpress locations on my WAMP server. Example of that organization :

d:\plugins\plugin1 // real loaction
d:\plugins\plugin2 // real location
d:\www\wordpress\wp-content\plugins\plugin1 // symbolic link
d:\www\wordpress\wp-content\plugins\plugin2 // symbolic link