I found myself with an array like
$a = array (0 => "Foo", 1 => "Bar" );

and thought it would be cool to be able to say 
$a = array_permute/switch ($a);

a being now: array ("Foo" => 0 , "Bar"=>1);
the value colision can use the style of extract() 3rd parameter.

what do you think?

-- teodor