Need 5 Unique advanced PHP articles

I am looking for 5 unique semi-advanced articles on php. The articles have to be of around 500 words and should only concentrate on a particular topic instead of being too generic. Give me the titles on which you can write and I will immediately accept you. Though you are welcome to refer any kind of online references, You are supposed to write the articles on your own. People who recycle content of wiki articles or have any such intentions need not reply. Regards ## Deliverables 1) Complete and fully-functional working program(s) in executable form as well as complete source code of all work done. 2) Deliverables must be in ready-to-run condition, as follows (depending on the nature of the deliverables): a) For web sites or other server-side deliverables intended to only ever exist in one place in the Buyer's environment--Deliverables must be installed by the Seller in ready-to-run condition in the Buyer's environment. b) For all others including desktop software or software the buyer intends to distribute: A software installation package that will install the software in ready-to-run condition on the platform(s) specified in this bid request. 3) All deliverables will be considered "work made for hire" under U.S. Copyright law. Buyer will receive exclusive and complete copyrights to all work purchased. (No GPL, GNU, 3rd party components, etc. unless all copyright ramifications are explained AND AGREED TO by the buyer on the site per the coder's Seller Legal Agreement). ## Platform doc