It turns out that all of these places ultimately only accept arrays,
not objects, so we can use Z_ARRVAL_P everywhere.
Also add _deref in a few places where the hash lookup result is
directly type-checked.
The Autoconf AC_PRESERVE_HELP_ORDER macro has been available since
Autoconf 2.59c [1] and in PHP it has been called conditionally on two places
to support older Autoconf versions. With recent updates and the macro
can be called unconditionally.
[1] http://git.savannah.gnu.org/cgit/autoconf.git/tree/NEWS
Instead overload get_properties_for for a few specific cases such
as array casts. This resolves the issue where ArrayObject
get_properties may violate engine invariants in some cases.
This resolves the long-standing issue where var_dump
a DateTime (etc) object makes a number of additional properties
accessible, which may also change other behaviors as a side-effect.
This patch syncs and bumps the minimum required version of Autoconf for
the `phpize.m4` script and the main `configure.ac` from previously mixed
2.64 and 2.59 to 2.68.
At the time of this writing Autoconf 2.63 is still the version on
Centos 6, however by the PHP 7.3 release current systems out there
should all have pretty much updated Autoconf versions to 2.64+ at
least. Centos 7 already has Autoconf 2.69, for example.
This provides more options to update and get current with the *nix
build system and also avoids broken builds in certain cases as pointed
out in the relevant discussion [1].
Additionally, phpize also already provides the `AX_CHECK_COMPILE_FLAG`
Autoconf Archive m4 file that has Autoconf 2.64 minimum requirement.
Autoconf 2.68 was released in 2010, 8 years ago, relative to this patch.
[1] https://github.com/php/php-src/pull/3562
Setting up an empty default handler is not only useless, but actually
harmful, since internal entity-references are not resolved anymore.
From the libexpat docs[1]:
| Setting the handler with this call has the side effect of
| turning off expansion of references to internally defined general
| entities. Instead these references are passed to the default
| handler.
[1] <https://www.xml.com/pub/1999/09/expat/reference.html#setdefhandler>
Nikita Popov