There are three approaches one could take here:
1) Expose web services and talk over HTTP -- this is probably the sanest / safest / most flexibile option
2) Use the database layer to share data, each app does it's own thing with it. Probably reasonable for legacy stuff, I wouldn't build something this way now.
3) PHP5 is capable of talking directly to .NET code using the
DOTNET class. Never have seen this one used in anger though.
In all honesty, you really want to do #1 in almost all normal cases.
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