Trouble Connecting to Database

Hi,

I've been asked to convert a script from ASP to PHP. I don't know
hardly anything about ASP (I'd like to keep it that way) and I've
certainly never converted a script from ASP to PHP. Formerly, the
script used to connect to the database with:

strconnect = "Provider=sqloledb;Data Source=" &dbserver & ";Initial
Catalog="&Database&";User Id="&Username&";Password="&Password&";"
Set rs = Server.CreateObject("ADODB.Recordset")
sql = "SELECT...."
rs.Open sql, strConnect

This is all the information available to me. What do I need to do to
connect to the database? If I knew what type it was it might be
easier, but I don't even know that for sure. Thanks!