Here’s an excellent tutorial that introduces the concept of Object Oriented Programming (OOP) in PHP. It is written lucidly but may be a little confusing if you don’t already have some basic familiarity with the PHP language.
Here’s another tutorial if you find that one a bit much.
public $prop1 = "I'm a class property!";
$obj = new MyClass;
echo $obj->prop1; // Output the property
digitalartsonline.co.uk have excellent tutorials. Here’s one that shows you how to make a vector illustration from a camera image. It uses both Photoshop and Illustrator and is a good way to experience the strengths of either.
In this tutorial, Eelco van den Berg lets you behind the curtain to see how he creates his incredible vector portraits by turning a photo into a ‘poppy’ vector illustration.
It says that it could take 3-4 hours so you may want to make a cuppa.
photoshopessentials.com has a lot of well developed tutorials. I find them easy to follow even though some of the tutorials are for different versions of Photoshop than the one I have a license for. Regardless, most of the features are the same as Adobe is one of those companies who release new versions often despite very little change (something I find annoying).
This tutorial on how to use the Free Transform tool is a great place to start.