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Those are warning level notices, so at a minimum you would want error reporting set to E_WARN. For optimal code, set it E_ALL. If you are in PHP 5 set it to E_ALL | E_STRICT (since E_STRICT does not cover E_ALL in PHP 5 though there is talk that the two will be combined in PHP 6).
ANother thing you may want to do, in development at least, is to set display_errors to On so that you can the warnings and error notices instead of constantly having to refer to the error logs.