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
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