In vogue, when world talk about scripting languages on the web , PHP is superlative. If your server supports PHP you don't need to do anything. Just create some .PHP files in your online directory, and the server will analyze them for you. PHP augments web pages.PHP helps working with login pages, things like creating a username and password login pages, validating form details i.e. description , create forums, picture media galleries, surveys forms & research, and feedback data lot more things.
PHP gives us a simple way to interact with your visitors right from simple things like e-mail forms to more elaborate things like shopping carts that save your past orders and recommend similar products. PHP gives life to old, plain html pages through programing coding by developers, it is developer friendly , unlike other languages like c or Java where we define something and we don't use, PHP doesn't terminate the script rather it throws only notices and warning messages which is the best part of PHP as we can still see and execute the web pages rather than getting a blank page with error, PHP work on browser hence it is a server side language.
PHP has mesmerized with object oriented features.
PHP is compatible with different operating systems LAMP, WAMP, XAMPP, MAMP. Web hosts use the combination that fits their OS. Think of it more as apache-mysql-PHP instead of LAMP, MAMP, and WAMP. It's just a mixture of those three software packages.
The most visited social networking site “Facebook” uses PHP in back-end!
As well as below well-known websites uses PHP
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Google
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Apple
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Yahoo!
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Wikipedia
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Digg
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SitePoint
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Amazon
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Ebay
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YouTube
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Flickr
& The most popular explanation of just what PHP stands for is "Hypertext Pre-processor"