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PHP (Hypertext Preprocessor or Personal HomePage) was developed in the mid-1990's and has grown in popularity extremely fast. It's a server-side programming language used mostly on UNIX and LINUX servers. Because it's so easy to create interactive and dynamic web sites there are estimates that tens of millions of web sites now use PHP. When PHP, as with all server-side languages, receives a request for a file it processes the code contained in the file and dynamically builds the HTML response that is sent to the visitors web browser. PHP files usually end in the extension .php and can contain PHP code and HTML.
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