In this tutorial you will get the knowledge about reference variable. Any variable will be called reference variable, if it contains another variable as its value.

Reference variable in php

<?php
$a="b";

$b="a";

$c=$$b;

echo $c;

?>

Now its output will be b


How?
Let's solve it

1. $c=$$b;
2. $c=$a //Because $b value is a
3. $c=b // Because $a value is b

So $c is a reference variable.