On 12 Feb 2012 at 19:01, Stuart Dallas <stu...@3ft9.com> wrote: 

> Optional arguments must be given a default value...
> function my_func(&$arg1, $arg2, $arg3, $arg4 = null, $arg5 = null, &$arg6 =
> null)
> Note that passing a default value by reference was not supported prior to
> PHP5.
> All the relevant details are here: http://php.net/functions.arguments

Thanks, I do see an example now, although it's not stated explicitly.

Cheers  --  Tim

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