Deleted 7 old and low rated notes

Following were the 7 notes with a rating less than -5 and
are older than 1 year.

These notes represented 0.0% of the 17913 total user notes,
and have now been removed.

Rating | Note
-------+---------------------------------------------------------
   -7  | https://php.net/manual/en/function.sem-get.php#82920
   -6  | https://php.net/manual/en/function.log.php#86799
   -6  | https://php.net/manual/en/security.database.php#77088
   -6  | https://php.net/manual/en/book.curl.php#128264
   -6  | https://php.net/manual/en/function.array-change-key-case.php#100077
   -6  | https://php.net/manual/en/ref.math.php#67510
   -6  | https://php.net/manual/en/language.oop5.autoload.php#127184