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PHP is a general-purpose scripting language especially suited for web development. PHP generally runs on a web server. Any PHP code in a requested file is executed by the PHP runtime, usually to create dynamic web page content. It can also be used for command-line scripting and client-side GUI applications.

PHP can be deployed on most web servers, operating systems and platforms, and can be used with relational database management systems.

PHP primarily acts as a filter, taking input from a file or stream containing text and/or PHP instructions and outputs another stream of data; commonly the output will be HTML. Since PHP 4, the PHP parser compiles input to produce byte-code for processing by the Zend Engine, giving improved performance over its interpreter predecessor.



Originally designed to create dynamic web pages, PHP now focuses on server-side scripting, it is similar to other server-side scripting languages that provide dynamic content from a web server to a client, such as Microsoft's Active Server Pages, Sun Microsystems' JavaServer Pages, and mod_perl.

PHP has also attracted the development of  frameworks that provide building blocks and a design structure to promote rapid application development (RAD). Some of these include Cake-PHP, Symfony, Code-Igniter, and Zend Framework, offering features similar to other web application frameworks.

The LAMP and WAMP architectures have become popular in the web industry as a way of deploying web applications. PHP is commonly used as the P in this bundle alongside Linux, Apache and MySQL, although the P may also refer to Python or Perl.

Over dozen million Internet domains were hosted on servers with PHP installed, and mod_php was recorded as the most popular Apache module. Significant websites are written in PHP including the user-facing portion of Facebook, Wikipedia (MediaWiki), MyYearbook,Digg, Joomla, WordPress, YouTuSpeed optimization.

PHP scripts are normally kept as human-readable source code, even on production web servers. In this case, PHP scripts will be compiled at runtime by the PHP engine, which increases execution speed. PHP scripts are able to be compiled before runtime using PHP compilers as with other programming languages such as C (the language PHP and its extensions are written in).

Code optimizers aim to reduce the computational complexity of the compiled code by reducing its size and making other changes that can reduce the execution time with the overall goal of improving performance. The nature of the PHP compiler is such that there are often opportunities for code optimization, and an example of a code optimizer is the Zend Optimizer PHP extension

Another approach for reducing overhead for high load PHP servers is using PHP accelerators. These can offer significant performance gains by caching the compiled form of a PHP script in shared memory to avoid the overhead of parsing and compiling the code every time the script runs. A PHP accelerator will be built into PHP 6.