Advanced PHP Tutorials

I have recently gotten back into programming. And I am learning that there is so much more out there then there once was. I mean I already knew there was. I like the concept that you can take short tutorials and learn the basic's in no time. However, once you get past the basics, you have to goto each function and see what it does. I do most of my programming in PHP. I know with advanced PHP there is things like cURL scripting, web scraping, AJAX and many other things. What I want is a bunch of advanced easy to understand tutorials on all these subjects. I would like suggestions on what tutorials I should make. If you are an expert in 1 tutorial and somebodyelse is an expert on something else I can make a private project in order to hire more then 1 person. I am going to create a webpage and set up these tutorials sort of the same way as w3school does. I am going to call these tutorials something like Advanced PHP tutorials. I would like tests questions that I can add at the end of the tutorial Perhaps after I have it together I can sell an advanced PHP certificate to people who can pass all the tests. Please let me know what it is you can write a tutorial about. What suggestions you have for tutorials. Let me see samples of past writing work as well as past programs.