I installed MSSQL and PHP with Apache (and php_mssql.dll). The thing is that it's not connecting and it's not even returning an error message ! Before i install the .dll, it was just stoping at the connexion command (without error). Now, it's passing trought, but ignoring all the stuff related to the DB (queries, connexion..). But i don't get ANY error. Really strange. And yes, i'm sure the php works, it's from work and i have the same database and code...
