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require and require_once practicly has the same effect if you're not using loops on anything. I would recommend require() since it'll stop the script once there's an error with the file, not just continue on like include().
i use include and include_once if i add only html tags or or something with design and like this or not so important codes. for important and core codes i use require or require_once. The difference between the function and _once is explained by Nay.