哪个.so文件可以用于linux系统对应windows中的.dll文件，将php连接到ms sql server

I have used php5ts.dll files for php and ms sql server connection on my windows sytem but i need to do same for linux but same dll files do not work on linux as they are for windows. After Rnd I came to know that corresponding to dll files in windows we need .so files in linux I have used php5ts.dll files for php and ms sql