Can someone explain me again variable variable?

Answer 1

you can specify one variables name using another
<?php
$a = 'hello';
$hello = "Hi!";
echo $a;
?>

Answer 2

<?php
$a = 'hello';
?>

A variable variable takes the value of a variable and treats that as the name of a variable. In the above example, hello, can be used as the name of a variable by using two dollar signs.

Answer 3

In php, variable is a container, example look at it as a bank vault where u store on keep cash. In the same way, u store in information in a container called variable

Answer 4

its simple that means ur assigning/calling same value through another one...