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<div align=justify>PHP files are usually like HTML files but the PHP files can include both PHP and HTML code. The main difference is HTML is a tag language which is used to describe mainly the public part of the website and PHP is a script language of higher level which actually allows creating scripts which addresses user requests to the database.


The output of PHP is mostly in HTML code as when a user accesses a PHP page; the web browser only sends HTML code, since the web server has processed the PHP code in the background. So the web browser would get the same HTML code if it is set as the output of your PHP script but advantages of some advanced features can be achieved that are offered by PHP.

PHP allows the coder to create an HTML page or section of the page dynamically. While when coding is done in HTML the pages coded by you would always appear same depending on which browser you are using. Moreover, PHP is also capable of taking data and use it or manipulate it to create the output what user wants.

A web page that can actually take two numbers, add it and present the result to the user can be easily done by PHP but this is not possible by HTML. To use .php extension is very important while coding in PHP as it tells the web server that the page includes PHP code and so it may run through the server’s PHP engine before sending to the client’s web browser.

PHP also allows generating dynamic content each time web page is loaded by the user like current date and time, data from form fields by user or from a database, etc. Because of so many additional features it needs to be implemented in a proper structure of coding unlike HTML where kept anything anywhere creates an output. This will not be the case with PHP, as it will not give you any output if something is wrong with coding. Also, learning time of PHP is longer than HTML as it is more complex and sophisticated language comparatively.
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''Article source: http://www.open-source-web-development.com''
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