PHP includes are one of the first things anyone using PHP uses. And they’re used in almost all professionally built sites. This post explains how they work and some of the tricks to use them effectively.
Apache, the web server software that runs most web sites, provides the developer with basic information about the page request via what are called “environment variables”. This post explains how to access Apache environment variables using PHP, and some tricks to use them effectively.
A basic introduction to variables in PHP. This post covers how to set the value of a variable, the difference between numeric and textual variables, and some other PHP basics about functions and statements.