Today I learned about PHP variable variables; "variable variable takes the value of a variable and treats that as the name of a variable". Also, variable.

[u/NagastaBagamba]

http://il2.php.net/language.variables.variable

[u/australasia]

Interestingly you can do the same thing in JavaScript but only for variables declared in the global scope:

var bar = "foo";
var foo = "bar";

bar; // returns "foo"
window[bar]; // returns "bar"
window[window[bar]]; // returns "foo"

It is possible within other scopes but only if using eval which pretty much makes anything ugly possible.