Store function result or call it each time? [closed]

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I have a class with a protected variable in it which can be get by a function getVariable().

How much difference will it make if i'll call getVariable() every time instead of storing the result once and then use it? (the getVariable(开发者_如何学编程) does nothing more than return $this->var)

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It should not matter either way for you, premature optimization is bad. Do what makes sense design wise, not optimization wise. Either way, function/method calls in php are pretty cheap.