What does $$ do?

[tangoforce]

Just wondering what $$variable_name does?

[felgall]

It references the variable whose name is in $variable_name.

For example id

$variable_name = 'x';
$x = 5;

Then $$variable_name references the 5 stored in $x.

[crmalibu]

http://www.php.net/manual/en/languag...s.variable.php

[Jake Arkinstall]

It should be mentioned that doing this is bad practice and shows instability in the programming itself - in other words, you should know what variables you are using.

Arrays are much more suited.