TDJ Could you go into a little more depth on the problem, just so I
TDJ understand?
The problem is that passing argument passes only zval *, i.e. pointer to
variable itself. To make reference assignment, you need zval **, i.e. the
place in the symbol table.
--
Stanislav Malyshev, Zend
Brad LaFountain [EMAIL PROTECTED] writes:
PHP_FUNCTION(ref_assign)
{
zval *bar, *foo;
if (zend_parse_parameters(ZEND_NUM_ARGS() TSRMLS_CC, zz, bar, foo) ==
FAILURE) {
return;
}
ZVAL_ADDREF(foo);
*bar = *foo;
bar-is_ref = TRUE;
Stanislav Malyshev [EMAIL PROTECTED] writes:
OK, looking again on the matter in depth, it seems to me that you cannot
do it from C function either, due to the way in which parameters are
passed in the engine.
Could you go into a little more depth on the problem, just so I
understand?
I'm trying to do some extension programming, and I'm pretty confused
by the whole zval thing. In particular, references are a little
mysterious. If I have
$foo = zonk;
$bar = $foo;
in PHP, what actually happens? Specifically, if I wanted a function
that did such a reference
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
Stanislav Malyshev [EMAIL PROTECTED] writes:
*snip*
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_FUNCTION(ref_assign)
{
zval *bar, *foo;
if (zend_parse_parameters(ZEND_NUM_ARGS() TSRMLS_CC, zz, bar, foo) ==
FAILURE) {
return;
}
ZVAL_ADDREF(foo);
*bar = *foo;
bar-is_ref = TRUE;
bar-refcount = 1;
}
this works, but i
- 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
Stanislav Malyshev [EMAIL PROTECTED] writes:
Ah. Then you need to accept the first parameter by reference (this is
defined in ZEND_FE definition, put first_arg_force_ref as second
parameter). Then you get parameters the usual way (zend_get_parameters_ex,
etc.) and have to zval **
TDJ Thanks for your response! While it does not cause a crash, your
TDJ function doesn't do what I expected. Do you know where I went
TDJ wrong?
You are right, this doesn't work. I'll look a bit more into it...
--
Stanislav Malyshev, Zend Products Engineer
[EMAIL PROTECTED]
TDJ Thanks for your response! While it does not cause a crash, your
TDJ function doesn't do what I expected. Do you know where I went
TDJ wrong?
OK, looking again on the matter in depth, it seems to me that you cannot
do it from C function either, due to the way in which parameters are
passed
TDJ Sorry, I wasn't clear. I mean ref_assign to be a C function, in my
TDJ extension.
Ah. Then you need to accept the first parameter by reference (this is
defined in ZEND_FE definition, put first_arg_force_ref as second
parameter). Then you get parameters the usual way
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