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Date: Thu, 27 Apr 2006 13:01:09 -0700
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To: Rasmus Lerdorf <rasmus@lerdorf.com>
Cc: Brian Moon <brianm@dealnews.com>, internals@lists.php.net
References: <444FF5CD.2010805@dealnews.com> <444FF716.6070201@lerdorf.com>
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Subject: Re: [PHP-DEV] Passing functions to function by reference
From: brion@pobox.com (Brion Vibber)

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Rasmus Lerdorf wrote:
>> PHP 5.0 broke this.  There was a fatal error on the array_shift that
>> only variables could be passed by reference.  There was a good
>> argument for it.  So, we started migrating our code.
>>
>> Well, seems this works in 5.1.  So, my question is, was it an
>> intentional "fix" or will this break again and we need to continue to
>> watch for this?
>=20
> In 5.1 this now throws an E_STRICT instead of a warning.  It is still a=

> bad idea to pass a tempvar by reference, so yes, you should strive to
> write E_STRICT clean code.

Stupid question: why is it a bad idea?

I would expect these to be equivalent for all intents and purposes:

  func_taking_reference(some_func());

and

  $temp =3D some_func();
  func_taking_reference($temp);

where $temp is never used again and quickly passes out of scope.

Is there some reason that they are not considered equivalent, or that the=
y
cannot or should not be made equivalent?

I seem to remember a reason being quoted for all these reference-related =
changes
something like it can cause memory corruption. But that would appear to b=
e an
implementation bug, not an essential difficulty, as if it were really *me=
mory
corruption* I can't imagine it being turned back on in 5.1. :)

-- brion vibber (brion @ pobox.com / brion @ wikimedia.org)


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