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To: internals List Developers Mailing <internals@lists.php.net>
Date: Sun, 2 Jan 2005 15:35:05 +0900
Subject: extract(EXTR_REFS) and pass-by-reference
From: moriyoshi@at.wakwak.com (Moriyoshi Koizumi)

Hi there,

I'm now looking into the three extract() bugs related to
each other, namely bug #25708, bug #29493 and bug #31213.

It turned out after all that these problems are caused
by a inevitable zval separation on sending arguments
to the function and there seems to be no feasible workaround
for now. I got stuck with a couple of mentioned ways that fix
the problem just partly, not entirely.

a. Specify first_arg_force_ref to PHP_FE(extract).
   This will cause the engine to yell a 
only-variables-can-be-passed-by-reference!
   when you directly pass a scalar (temporary variable) to it.

b. Turn on allow_call_time_pass_by_reference.
   This is anyway deprecated, but looks like the best way around from the
   my point of view.

Any suggestions will be appreciated.

Moriyoshi