PHP's usage by a web server to create a response or document to send back to the browser.
PHP as a server-side language, meaning it runs on the web server. This is in contrast to a client-side language such as JavaScript.
What you sign up for when you decide to use PHP: it's free (in terms of money and speech), cross-platform, popular, and designed for web programming.
How PHP programs that print information, process forms, and talk to a database appear.
Some basics of the structure of PHP programs, such as the PHP start and end tags
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