uh oh, I defined a resoruce

I have been using define to create a constant for the link resource returned by mysql pconnect like so: $PL = @mysql_pconnect("localhost", $DBUser, $DBPass); define("SITE_DB",$PL); Later I use the constant to select my databases. mysql_select_db($SrcdbID ,SITE_DB); This code seems to be working as I expected and I have many thousands of llines of code done over several years using this construct. But, I happened to be reading the php doco today and noticed that you are not supposed to use define for resources, so question is, is what I am doing safe or am I going to run into problems and if so what is the best way to globally pass resources to multiple classes and functions, command line scripts etc? Cheers Charlie Reese