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Hypertext preprocessor 4.0 (PHP 4) is a server-side scripting language used to create dynamic Web pages. PHP is a popular scripting language used extensively for quickly and effectively creating dynamic Web applications. Easily embedded into HTML code, PHP can also be easily connected to databases such as MySQL and PostgreSQL.
PHP 4 is powered by Zend Engine, which helps increase performance and allows working with encoded files through Zend Optimizer. The script engine used in PHP 4 has been rewritten to optimize performance.
The main features newly added to PHP 4 are:
PHP 4 is a cross platform scripting language supporting a wide range of data bases, including Adabas D, InterBase, Solid, dBASE, MySQL, Sybase, Empress, MySQL, Velocis, FilePro, Oracle, UNIX dbm, Informix and PostgreSQL.