Trying to Find a Bug in WordPress

I stumbled over some WordPress code involving caching. Immediately I had this idea about MD5 collision and how this could affect the implemented logic. I started going down a rabbit hole exploring the feasibility and eventually setting up a PHP debug environment. Only to realize that the idea was flawed from the start. So while this ends up being failed security research, we still learn a lot along the process.

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bug code collision debug down environment find logic md5 php start wordpress