setting function variables

I am trying to specify a single php file to contain all the variables and I just call this file where necessary. What I am running into is that I want to do this for all the built in functions (i.e. mssql_query) as well. I've tried numerous attempts but can't get it to operate without wanting to run the functions or return an error. Something like this: $runQuery = @mssql_query; $qryResults = @mssql_result; $getRow = @mssql_fetch_row; $getRowNums = @mssql_num_rows; I've tried using the %, $, "",'', and the @ symbol without any luck. Anyone know of way to do this, so I can use a generic name for all the functions and be able to distribute it to those using either SQL Server or MySQL without them having to go through the code and manually change it? thanks