What are $$ variables?

[Anon]

I came across this: $$var ... in a page of php code the other day and tried to lookup what it meant in the php man. Does anyone know what this means? Is it a reference to another variable? Thanks!

Ted

[Anon]

This is probably indirection, I have done that in perl, and php probably borrows from that. It works like this:

$a = "b";
$b = 5;

echo b; / this prints 5 /
echo a; / this prints b /

$$a = 10; // the point of indirection

echo b; / this prints 10 /
echo a; / this prints b /

basicaly this works as a pointer almost, its saying, treat the string in $a as the name of a variable.

[rrijnders]

http://www.phpbuilder.com/manual/language.variables.variable.php