day 1 basic concepts of php

Q:- what is php ?
Ans:-  php Hypertext Preprocessor or personal home page .
it is a widely-used open source general-purpose scripting language .
basic example of php language ...

example 


        <?php
            echo "Hi, I'm a PHP script!";

        ?>
here:-
<?php - it is known as opening state.

?> - it is known is closing state.

it every user  find why we used php language ? and why we used php language ?
don't matter for confusion .
whats requirement for php language ?

1. server there are four types 1-wamp, 2- lamp, 3- mamp, 4- xamp,
2. dreamweaver
3. not any for hardware and software requriments it is free of cost available.

why is the differences between dot net and php ?

• php is open source  technology but dot net is not.
• it is free of cost
• not hardware and software requriments.
• it is run any types of systems like linux, mac , win bassed etc. 
•  

1. software requriments;-
2. server appache
3. php interpreter
4. database- mysql
5. server as define as above-
   

 note:- how to display our output:

1.   we used three types of 
2. echo
3. print()
4. print_r()-it is used for array only...