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To be fair, it is decompiled code you are looking at. If you open the dropdown you will find the optgroup with the label that says "Decompiled".

they re-implemented all functions in .net. The code is decompiled from bytecode thats why its incomprehensible and hence the title PHP to .NET and not PHP to C#.

Like someone below already answered, it's actually compiled to MSIL and what you're looking at is decompiled C#. All PHP functions have been reimplemented in .NET.