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PostgreSQL is an object-relational database management system (ORDBMS) based on POSTGRES, Version 4.2, developed at the University of California at Berkeley Computer Science Department. PostgreSQL is an open-source descendant of this original Berkeley code. It provides SQL92/SQL99 language support and other modern features.
PHP as a scripting language is similar in syntax to other scripting languages such as Perl and ASP. The most notable difference is its speed and ease of use. PHP is interpreted. The source PHP that you write is stored in a web server. The server's Apache Web Server process reads that source file in as a user requests it via a web browser. Apache uses the PHP plug-in to interpret the PHP source code and perform the actions specified in code.

The Apache HTTP server is a powerful, flexible, highly configurable, HTTP/1.1 compliant web server that implements the latest protocols and is extensible with third-party modules. The Apache module API provides full source code and is developed under the GNU GPL Software license, facilitating user customization. Apache runs on Linux, Windows NT/9x/2000, and Netware 5.x and above, OS/2, and most versions of Unix, as well as other operating systems.