I have the below code running on at the top of every file. Do I need the if statement. I have been using this implementation for a long time and most likely acquired it when I was first learning. My understanding now is that I do not require the if statement but I would like some clarification if this is a good practice or not.I have the below code running on at the top of
阅读背景：
设置定义SESSION是否有点过分
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