PHP is a programming language that allows your website to go beyond a basic HTML document, and create an interactive experience. Open source means that the source code is available to someone with proper access to the site, so that they can easily make changes. When the Internet was first getting started, most of the pages on websites were basic HTML documents. Meaning that when you visited a page (about.html, for example), you downloaded all of the content of the page into your browser.
How Do I Know if I have a PHP Site?
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