There's an interesting discussion happening in the /r/php subreddit on Reddit.com that asks about taking a job if a custom framework was involved.

i recently got a new job and whilst I'm working my notice period I've been tasked to find my replacement. One of the big questions my boss has is whether a developer would mind taking over a MVC framework I built specifically for the company. (I would explain why we didn't use Laravel / Symfony / Zend etc. but that's a whole post in itself). The framework is conventional and should feel familiar to someone with Laravel experience... But at the end of the day it's totally proprietary. It's built to PHP-FIG standards and would come with full documentation. So, would you have any issues taking the job, or would you be put off?

There's opinions shared that lean both ways, but there seems to be a large majority that strays more heavily into the "no" column. They suggest that, with all of the great and well-developed PHP frameworks already out there, a custom one would probably cause more problems that it solves. While there's plenty of technically oriented comments, there's also a few that are more "high level" looking at the reasoning for taking the job (hint: it's not just about technology) and what the needs/requirements of the business are.