To give your more practice using arrays, there are some scripts for you to try out. The scripts are amongst the files you downloaded (in the scripts folder). The file you're looking for is called scripts.txt. You can also copy and paste the scripts by clicking on the links below.
Script One - Set up an array and print out the values
Script Two - Set up an array with your own Keys
Script Three - Set up an array with mixed values
Script Four - Assign values to an array: Method Two example
Script Five - Looping round values in an array
Script Six - Looping round values in an array: example 2
Script Seven - Using text as Keys
Script Eight - Looping round an Associative array using For Each
Script Nine - Sorting Arrays (Associative)
Script Ten - Sorting Arrays (Scalar)
In the next section, we'll move on to String Manipulation with PHP.