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Various aspects of PHP language

PHP language is primarily a web development language. The web page designs which use PHP are simple yet dynamic. PHP can also be termed as a general purpose scripting language. The html source document is embedded with the PHP code. It is then translated and interpreted by a web server which contains a PHP processor module. The web server then develops the web page document. The PHP is further upgraded to have advanced capabilities like command line interface. It can also be used for standalone graphical applications. PHP installation is easy and can be installed on almost all web servers. The upgraded standalone interpreter helps its installation on every platform and operating system without involving any cost. PHP competitors include active server language of Microsoft, and other languages which are similar to it. PHP is free software. It was release under OHP license and was created by Rasmus Lardorf in the year 1995. The PHP group now produces the PHP. It is the sole standard regulating body for PHP as there are no other defined specifications.

History of PHP

The maintenance of his personal home page by Danish programmer Rasmus Lerdoff led to the creation of PHP. He used Perl scripts for the process, which he termed as personal home page tools. By using this script, he was able to display his resume and record his web page traffic. With the successful creation of PHP, a formal announcement was made on infosystems.com. Since then, various web developers have contributed towards the development of PHP. PHP 3 was formed by Zeev Zuraski and Andy Guttmann, who developed PHP 3 by rewriting the parsers in the year 1997. PHP 5 is the current version, which is the most stable version of all forms of PHP.

PHP still does not support multibyte strings (Unicode). Work is going on to incorporate it in PHP 6 or any other future version of PHP. This will help to allow strings in PHP and the non ASCII characters will be contained in class, function and method names. Both 64 bit and 32 bit systems can run on PHP. The 64 bit windows operating system uses internet information services (IIS) for PHP programming while the official PHP is contained on the 32 bit Microsoft windows which contain the PHP implementation. The 64 bit versions did contain the PHP 5.3.0, but because of various deficiencies and problems, the PHP script has been removed from them.

PHP usage and other features

PHP is essentially designed for server side web development. The PHP runtime executes the PHP code, and thus forms the webpage or images which are very dynamic in nature. The contents and images can be used for websites and for other purpose as well. These can be also used for command line GUI applications and command line scripting. PHP can be readily used with any relational database management system. Anyone can build, customize and extend the PHP for its own usage with the help of PHP group which provides the complete source codes for users who are interested.

PHP output is in html, which is obtained from filtering the data inputted. The data is contained in a file or stream and can comprise of PHP instructions or text. The PHP 5 has improved performance since the PHP parser now produces byte code which is further processed by the ZEND engine.

The web applications developed are deployed using LAMP architecture. LAMP stands for Linux, apache, my sql and PHP. Other packages like WAMP (windows, apache, my sql, PHP) and MAMP (mac os x, apache, my sql, PHP) are also available and are used as per specific needs. PHP has been installed around 20 million times form its domain and its various extensions. Of all the Apache http server modules, mod_php is the most popular