----- Original Message -----
From: "Stanislav Malyshev" <[EMAIL PROTECTED]>
To: "Tim Daly, Jr." <[EMAIL PROTECTED]>
Cc: <[EMAIL PROTECTED]>
Sent: Thursday, October 17, 2002 5:34 PM
Subject: Re: [PHP-DEV] trying to understand zvals
> TDJ>> I'm trying to do some extension programming, and I'm pretty confused
> TDJ>> by the whole zval thing. In particular, references are a little
> TDJ>> mysterious. If I have
> TDJ>>
> TDJ>> $foo = "zonk";
> TDJ>> $bar =& $foo;
> TDJ>>
> TDJ>> in PHP, what actually happens? Specifically, if I wanted a function
>
> What actually happens is that both entries in symbol table with names
> "foo" and "bar" point to the same zval (having refcount of 2 now)
> containing string "zonk".
>
> TDJ>> that did such a reference assignment:
> TDJ>>
> TDJ>> $foo = "zonk";
> TDJ>> $bar = "baz";
> TDJ>>
> TDJ>> ref_assign($bar, $foo); // $bar =& $foo;
> TDJ>>
> TDJ>> what has to happen in ref_assign?
>
> That's problematic, due to the way PHP variables work. The best you can do
> is something like this:
>
> function ref_assign($a, $b) {
> $GLOBALS[$a] =& $GLOBALS[$b];
> }
>
> ref_assign("bar", "foo");
>
> That's assuming they are globals. If they are not, I cannot now think of a
> good way to make variable-binding function.
> --
I think he wants to know how to do that in C.
Andrey
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