Php calls c # solution

Php calls c # How do I call functions in c # Using php ?? Which of the following is a trick? ------ Solution -------------------- function? Then you can only write a dll and call php ------ solution ------------------ write php extension does not ............ If it is written, you will not have this question; do not use php to call c #
How can I use php to call functions in c ?? Which of the following is a trick?

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Function?
You can only write a dll and call it for php.
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I can write php extensions ............
You won't have this question if you write it;
If not, check the relevant documents first.
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1. confirm that. net is installed on your server.
2. confirm that the com_dotnet extension has been loaded.

Test code in the manual

$ Stack = new DOTNET ("mscorlib", "System. Collections. Stack ");
$ Stack-> Push (". Net ");
$ Stack-> Push ("Hello ");
Echo $ stack-> Pop (). $ stack-> Pop ();