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PHP is a server side scripting language, and is a powerful tool for making dynamic and interactive Web pages quickly.PHP is a widely-used and it it is free.
Official PHP website has installation instructions for PHP
@ http://php.net/manual/en/install.php
<!DOCTYPE html>
echo "My first Php Page";

What is Php file?
* php file is a text/html file with extension php ie. index.php
* It includes html, css, javascript just like a html web page.
* php codes start with <?php and end with ?> is executed on server side and it replace by the output.
* php codes in a php file is not send to the browser, it replace with its output.
* php codes can be written many times in a single php file in paragraph as well as inline.
Why PHP?
* PHP is an easy language to build site very easily with less effort.
* Php support multiplatform ie. Mac OS, Linux, Windows, Android.
* Easily connect to database for fetching and storing records.
What can PHP do?
* PHP can generate dynamic page content.
* PHP can create, open, read, write, and close files on the server.
* PHP can collect form data.
* PHP can send and receive cookies.
* PHP can encrypt data.
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