passing by reference with defaults

[Gasolene]

is it possible to have an optional reference parameter in a function??

function someFunction( $var1, &$var2 = NULL ) // doesn't work
{
    if( $var2 )
    {
        $var2++;
    }
    return true;
}

I want var2 to not be required, i realize that it is referenceing some memory block and is not a local var.

if not, is it possible to have multiple function definitions with the same name but diff parms?

[Pig]

function my_function($var_required, $var_optional = "")
{
//blah
}

Arguements can be left out if they have a default value like shown above. When called, functions can leave out parameters from right to left. So if you have 3 optional vars and you want to leave out the first, you have leave out the other two (because they are to the right of the var).

[Pig]

In regards to your second question, that is called function overloading. You can do that in C++, but I don't think PHP allows it.

[Gasolene]

thnx for reply,

u may hav misread, I am trying to have defaults for referenced vars, not passed vars.

ex:

function someFunction( $var1, $var2 = NULL ) {} // this works
function someFunction( $var1, &$var2 = NULL ) {} // this does not