Where to find the reference for the double dollar PHP syntax?

Question

Hi guys, i hope that everyone here know the php 'variable variable' syntax:

$color = 'red';
$red = 'yes, im red';
echo $$color;
//output: 'yes, im red';

but my problem is: how this syntax is named? i'm trying to find the reference on php.net, with no results (i wanna know if this feature will be kept in php6, the others attributes, etc...)

Answer 1

Variable Variables

And yes it will be kept in PHP6 as far as I know.

Answer 2

Just to share some tips.

To avoid confusion, you may use the curly braces.

${$color}

One of my team member removed the double $, thinking of typo error. Perhaps doing so will avoid confusion.

Answer 3

Removing this from php would be a really pointless decision as this functionality comes really handy in many scenarios while having no real disadvantages / problems associated with it.