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There are various websites which offer tutorials on simple PHP scripts. Both the Elated, and the Free Webmaster Help websites offer many tutorials to help with PHP scripting.
Most online programming services will charge for PHP programming service. However, there are many free PHP programming tutorials available.
Working with PHP & Flex requires more guidance than we can give here. I would check out their tutorials. wikidocs.adobe.com/wiki/display/Flex/Flex+and+PHP
Students like tutorials since they are easy to grasp. They enable students get the fundamentals without having to spend a lot of time.
Go to w3schools. You can find tutorials there to learn PHP. You can also find documentation about PHP at the official PHP website - but I recommend you learn the basics before you use it. It helps if you are also familiar with similar languages, like C.
Unfortunately I am not specialst in AjaX, but I can advice you these online tutorials:php tutorials. There are many articles about php, AjaX and interaction between AjaX and PHP in whole.
One can find more information about the php mysql tutorial on Tutorials Point, Tizag, and W3 Schools. More information about the php mysql tutorial can be found at Site Ground.
I have added a link to a Socket Programming in PHP guide to the related links section below. That should supply all the information you need to learn.
It would be better if you just view them online. There is enough material available on the web for PHP. If you still want to download and view it offline, then I suggest one of the PHP E-books
The quickest way to learn JSON with PHP is to check out the following websites: Tutorials Point, W3 Schools, IT Newb, Stack Overflow and many many more.
You can find information about how to use PHP 5 on the official PHP website, PHP.net, through the PHP 5 documentation section. Additionally, online tutorials, forums, and books dedicated to PHP programming are great resources to learn how to use PHP 5 effectively.
Hands on is the best way to learn it. Get yourself a host or install a local Apache server and jump right in! Check out the related links for Video tutorials for beginning PHP development.