How to enhance my PHP development skill and also start learning .NET to get into it?

I am in the PHP development with basic development skill. I want to enhance my skill to master level and also want to start learning .NET to become good .NET developer too. What are the good ways, available resources, good books and other thing that you can suggest me to start with?

Take every single project you can and try to develop new apps.

Then spend some serious time downloading some Open Source systems and examining how they are structured and how they work. Find some well structured examples then make some improvements for practice.

You will certainly need to spend some serious time coding but you will also need to read and find some best of breed examples. Look up PHP Best Practices on a search engine and that will provide some reference info.