PHP borrows a bit of its syntax from other languages such as C, shell, Perl, and even Java. It is really a hybrid language, taking the best features from other languages and creating an easy-to-use and powerful scripting language.
When you finish reading this chapter, you will have learned
The basic language structure of PHP
How PHP is embedded in HTML
How to write comments
Managing variables and basic data types
Defining constants for simple values
The most common control structures, most of which are available in other programming languages
Built-in or user-defined functions
If you are an experienced PHP 4 developer, you might want to skip to the next chapter, which covers object-oriented support of the language that has changed ...