Introduction to PHP
PHP (recursive acronym for PHP: Hypertext Preprocessor) is a widely-used open source general-purpose scripting language that is especially suited for web development and can be embedded into HTML. Essentially, PHP code is executed on the server, generating HTML which is then sent to the client. It is used to manage dynamic content, databases, session tracking, even build entire e-commerce sites. PHP is integrated with a number of popular databases, including MySQL, PostgreSQL, Oracle, Sybase, Informix, and Microsoft SQL Server.