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Just a heads up, starting with WordPress 4.7+, the global wp_filter
a few things have changed.
https://make.wordpress.org/core/2016/09/08/wp_hook-next-generation-actions-and-filters/
I only know about this because I wrote a function to remove filters when you don’t have access to the class object, which has to be updated to work with 4.7+ as well. Use this plugin a lot so wanted to give you a heads up before it becomes an issue.
https://gist.github.com/tripflex/c6518efc1753cf2392559866b4bd1a53