Whereas the previous chapter offered a bird’s eye view of PHP for beginners, this chapter goes into detail. It’s not intended to be read at a single sitting. Dip into it when you need to find out how to do something specific, such as build an array or use a loop to repeat an action. The following sections don’t attempt to cover every aspect of PHP, but they’ll help expand your understanding of the rest of the book.
Understanding data types in PHP
Using arithmetic operators for calculations
Understanding how PHP treats variables in strings
Creating indexed and associative arrays