function with optional parameter passed by reference

[Adam Dyga]

Hi,

How to create function with optional parameter passed by reference?
I've tried sth like this:

function (&$param=NULL) // or: function (&$param=new array())
{
//...
}

but parser is complaining that it expected ')' after $param.
I know functions with optional parameters passed by reference exist in PHP
(ie. ereg). So what am I doing wrong?

--
Greets
adeon

[Pedro Graca]

Adam Dyga wrote:

function (&$param=NULL) // or: function (&$param=new array())
{
//...
}

It does not work with PHP 4.

It works with PHP 5 (but not the second format)
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