NYCPHP Meetup

[Hans Zaunere]

This is always a confusing topic, and I'd just like to point a couple things out; hopefully without confusing it more.


>>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.

Actually, variables are always passed by reference, although they are "weak".  This means that as long as a argument isn't written to or changed in any way, inside the function, the variable's contents aren't copied.  Only when the argument is written to, are the contents copied, ie copy-on-write.  This doesn't apply, however to objects, IIRC.


H