2009/7/6 Lupus Michaelis <mickael+php@xxxxxxxxxxxx>:
> Hi,
>
> I would like to know if I am alone to be shoked by this :
>
> == 8< ==
> function foo(& $bar = null)
> {
> }
>
> foo() ; // runs
> foo(null) ; // raise an error
> == >8 ==
>
> Why the default value to null for a reference is allowed ? Is it a bug, a
> feature ?
You appear to be using the definition of null that comes from the
world of C. A null in PHP is not the same as a null in C - it's a real
value (of type null), not the absence of a value. So what you're doing
is the equivalent of passing a literal value, something you can't do
when the function is expecting a reference.
See the manual for more info on the null type: http://php.net/null
-Stuart
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