Helper function to unhook anonymous class methods

[johnjamesjacoby]

Problem: it’s pretty common (even if it’s not polite) for plugins to use a class constructor to hook their own public methods into things, but doing so makes it near-impossible to unhook procedurally.

Solution: I just ran across the following function on StackExchange, and imagined something similar could be quite useful to have globally available:

​https://wordpress.stackexchange.com/a/304861

It’s gnarly, but it works, and I think having WordPress core include this functionality makes more sense than having plugin authors all include their own version of it.

[zodiac1978]

Related: #23259

[TimothyBlynJacobs]

Related: #46635.