5. a way to produce dynamic web pages (sites that are unique to the user or continuously updated).
6. clear and easy to read and de-bug, as well as flexible, scalable, and extensible.
7. used by 20 million websites and 1/3 of the web's servers
8.
9. PHP scripts are plain-text files with PHP instructions; the language borrows from C and Perl, and can be imbedded into HTML. The pages are treated similarly to HTML pages. How it works: you write code, the server reads it, and then replaces it with content in the browser. image by Wesley Fryer