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>
ICU 59 already requires C++11 by default. The minimum version required
by the core is 50, which is compiled with at least C++11 in many distros
as package defs tell. Headers for ICU versions between ICU 50 and 58 look
fine when included for C++11 compilation, the linking is thereof not affected.
The macro PHP_CXX_COMPILE_STDCXX is based on
https://www.gnu.org/software/autoconf-archive/ax_cxx_compile_stdcxx.html
The patch consists on allowing to read the corresponding switch in a user
defined variable instead of enforcing CXXFLAGS globally. That way, every
ext or SAPI can decide, which C++ standard is to be used. The
documentation is provided in the m4 file.
C++11 is already somewhat older standard, C++14 were better. However
issues with GCC < 5.0 and some other compilers are possibly to hit back.
Still there's some time to check for C++14 for ext/intl, too. Having said
that, C++11 in ext/intl and a mechanism to determine features is a good step
towards better C++ support.
