Core

The configuration variables PHP_VERSION, PHP_MINOR_VERSION, and PHP_RELEASE_VERSION are now always numbers. Previously, they have been strings for buildconf builds.

phpize builds now reflect the source tree in the build dir (as it already worked for in-tree builds); some extension builds (especially when using Makefile.frag.w32) may need adjustments.

--enable-sanitizer is now supported for MSVC builds. This enables ASan and debug assertions, and is supported as of MSVC 16.10 and Windows 10.

The --with-uncritical-warn-choke configuration option for clang builds is no longer supported. Select warnings to suppress via CFLAGS instead.

COM

The extension is now build shared by default; previously it defaulted to a static extension, although the official Windows binaries built a shared extension.

FFI

It is no longer necessary to specify the library when using FFI::cdef and FFI::load. However, this convenience feature should not be used in production.

Streams

If only pipe streams are contained in the $read array, and the $write and $except arrays are empty, stream_select now behaves similar to POSIX systems, i.e. the function only returns if at least one pipe is ready to be read, or after the timeout expires. Previously, stream_select returned immediately, reporting all streams as ready to read.