Good job, this tutorial is very well done.
I suggest also adding this exact text:
When creating new variables, if you are creating more than one you can always use commas instead of new lines.
PHP Code:
new color, color2, color3
Notice: I am not adding a comma on the last variable of the line. This is because it is the ending variable and no other variable after that is declared. Commas are only needed when creating new variables.