PHP5's C extension API has changed substantially so you need to use -php7 to specify you want PHP7 compatible wrappers. Fixes https://github.com/swig/swig/issues/571
This fails in a ZTS build of PHP.
git-svn-id: https://swig.svn.sourceforge.net/svnroot/swig/trunk@11434 626c5289-ae23-0410-ae9c-e8d60b6d4f22