Description:
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Sometimes, it is necessary to get the number of matches instead of the number of affected rows. Matches means for example in an UPDATE, where no changes were made (0) there could be some matches. There are two possebilities for that case: an own mysqli_info() parser or a new single count query. http://www.xarg.org/2009/12/php-hacking/

Reproduce code:
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$res = mysqli_query($h, 'UPDATE something ...');
echo mysql_matched_rows($h);
echo mysql_affected_rows($h);

Expected result:
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1
0

// if there is one row, that has the same value as we want to update

Actual result:
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-