* Inherit from message instead of implement
When regestering class (implmenets other class) during MINIT, zend_class_implements
would call zend_class_entry->interface_gets_implemented(). In PHP-7.3 interface_gets_implemented shares the same location with create_object.
However, during MINIT, the global object storeage hasn't been initialized. And thus, caused segment fault in php 7.3.
* Use zend_string_init where interned string may be the value.
zend_string_dup will keep using the existing interned string.
In php 7.3, interned string cannot be destroyed from user's code.
* Uncommment debug code
* Use latest phpunit for each php versions
* Revert change in Dockerfile
* Update php test to use the new docker image
* Update composer
* Change docker organization
* Update phpunit
* Debug phpunit
* Store phpunit into bin dir in docker image
* Install valgrind to docker
* Fix compatibility test
* Remove generated_service_test from compatibility c extension test
* Update 32bit php test to the new docker image
* Install bison
* Fix build.sh
* Fix DOCKERIMAGE_PREFIX
* Fix basename
* Add comment to build_and_run_docker2.sh
* Remove commented code
* Fix comments
* Use legacy name in php runtime
Old generated code cannot work with new runtime, because the new runtime
assumes new class name for nested message. For details see #4738.
* Remove unused method
* Add well known types to php runtime.
* Fix php7.0 tests
* No longer generate empty.proto in test as it has been included in
runtime.
* Fix zts build
* Clean code
* Rename g_p_b_empty to empty.
* Don't generate code for empty.proto in compatibility test
* Fix 32-bit
* Fix mac build
* Fix Makefile.am to add new files
