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Difference Between $ and $$ in php

Difference Between $ and $$
Difference Between $ and $$
As you all know how can we declare simple kind of variable in php .


$sign + name of your variable =  value that you want to assign to that variable .

For example :
$test = "testing continue";
$create = "world";

But now lets look at the use of $$ sign in php
First lets take an example  :

$create = "world";

$$create = "India";

This variables are same as

$create = "world";

$world = "india";


In short 

 echo   $create  $($create);

and 

echo  $create $world;
are same ..

Enjoy…...
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