Variable variables and functions without a doubt!
$foo = 'bar';
$bar = 'foobar';
echo $$foo; //This outputs foobar
function bar() {
echo 'Hello world!';
}
function foobar() {
echo 'What a wonderful world!';
}
$foo(); //This outputs Hello world!
$$foo(); //This outputs What a wonderful world!
The same concept applies to object parameters ($some_object->$some_variable);
Very, very nice. Make's coding with loops and patterns very easy, and it's faster and more under control than eval (Thanx @Ross & @Joshi Spawnbrood!).t
