PHP is a general-purpose scripting language originally designed for web development to produce dynamic web pages. For this purpose, PHP code is embedded into the HTML source document and interpreted by a web server with a PHP processor module, which generates the web page document. It also has evolved to include a command-line interface capability and can be used in standalone graphical applications. PHP web developer can be deployed on most web servers and as a standalone interpreter, on almost every operating system and platform free of charge. A competitor to Microsoft's Active Server Pages (ASP) server-side script engine and similar languages, PHP is installed on more than 20 million websites and 1 million web servers.
PHP acts as a filter, taking input from a file or stream containing text and instructions the outputs for another stream of data. The most common form of the output is HTML. The most popular architecture is the LAMP architecture for deploying web applications. In PHP the P is refer to Python or Perl and it is used as bundle alongside with Linux, Apache and MySQL.
PHP interface also has Extensions with a number of systems such as IRC, and Windows API. PHP extensions are used in creating Macromedia Flash movies. In the Version 3, PHP has integrated object oriented features and Version 5 has limited functionalities. Now PHP has robust object capabilities such as interface, exceptions, destruction and abstractions which are a great help in the development of a website.
PHP has wide-spread popularity because of the version 4. It is considered as one of the top languages used for server-based scripting. The language is easy to learn. PHP has many arrays and variables which can hold any type of object, where the variables need not be declared, and the syntax is remarkably simple.
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