Static methods and properties have a storied and controversial history in PHP. Some love them, some hate them, some love having something to fight about (naturally).
In practice, I find them useful in very narrow situations. They're not common, but they do exist. Today, I want to go over some guidelines on when PHP developers should, and shouldn't, use statics.
In full transparency, I will say that the views expressed here are not universal within the PHP community. They do, however, represent what I believe to be the substantial majority opinion, especially among those who are well-versed in automated testing.
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