AImager

class foo {
    var $bar = 'I am bar.';
    var $arr = array('I am A.', 'I am B.', 'I am C.');
    var $r   = 'I am r.';
}

$start = 'b';
$end   = 'ar';
echo $foo->{$start . $end} . "\n";        // I am bar.

$arr = 'arr';
echo $foo->$arr[1] . "\n";            // I am r.
echo $foo->{$arr}[1] . "\n";        // I am B.

$Bar = "a";
$Foo = "Bar";
$World = "Foo";
$Hello = "World";
$a = "Hello";

$a; //Returns Hello
$$a; //Returns World
$$$a; //Returns Foo