include, include_once, require or require_once?

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The only difference between the two is that require and its sister require_once throw a fatal error if the file is not found, whereas include and include_once only show a warning and continue to load the rest of the page. If you don’t want PHP to attempt to load the rest of your page without the database info (which I would assume), then use require_once. You don’t need to include the file more than once, so there is no need to use the regular require function.

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