On the BitExpert blog there's a post that shows you how to use the pdepend tool on PHP7, an automated tool that shows you the "quality of your design in the terms of extensibility, reusability and maintainability".
Being a good citizen of the PHP community we do test out internal libs against the current PHP7 codebase. So far we had no issues but then at one day one of our Jenkins PHP7 jobs failed. After investigating a bit it turned out that the problem was not part of our codebase but part of of pdepend. The pdepend process died with the error message that "T_CHARACTER and T_BAD_CHARACTER are no longer defined" which is true. The error was already reported as an issue on Github.
Unfortunately, as the problem here is a change to the core PHP language itself, there's not much of a workaround other than to just not run those certain jobs. He outlines how they handle detecting the tests that have problems, but only when run on PHP7. This allows them to run all of the tests and allow the automated system do to its work. When/if the problem is fixed in pdepend, all that's needed is to remove this one check and they're good to go.