NYCPHP Meetup

[crisscott at netzero.com]

> doesn't this need global $var_1,$var_2; in the swap function?

No.  Normally variables passed to functions are just copies used in the function scope.  When something is passed by reference (&$var), you are telling the function where to find the original variable.  When a function uses a variable reference it can make changes to that variable outside of its own scope.