php tutorial, How to declare variables in php 7 ?

Lest continue our lesson so you can quickly learn php 7

before declare variable you take care that PHP is case sensitive  

php script is always written between that line and file extension is .php  <?php  ?>

If you print hello world ,Lets write simple addition program and run it 

<?php

echo "hello world";

?>

Now save it to c:/wamp/www/demo (crate new folder) / and save it as  index.php , index.php file is magic file which not display in url mostly this file use in home page 

Now go to browser and type 

php variable 

variable name start with "$"( dollar sign) and note that first corrector is should not number
For example

•  $2name that is wrong

Right example is 

• $name 

php automatic detect data types of variable 

for example integer

$number= 20; 

for example float

$average= 20.4; 

Note that at last you need to add ;( semicolon )

Lets add to value 

<?php

$number1 = 10;

$number2 = 10;

$answer = $number1 + $number2;

echo "anser is - " . $answer;

 ?>

Note : If you want to add two value then you need . operator which combine to or more line

ok friend can practice of this chapter , in next lesson we will new things, we will learn in short time thank you