I have done this calculation:
$number = round(count($exc)/ count($grades),2,PHP_ROUND_HALF_UP);
When save,I have to save it into a field of an existing table which is a longtext type. The numbers got saved but become very long, something like 0.200000000000000011102230246251565404236316680908203125 I think this might cause extra db storage. When I query the numbers, they are still rounded as 2 digital. So, that's an extra converting job. I would like to learn how to save those numbers as rounded number?
You can use PHP sprintf function coupled with format specifier like so:
$number = sprintf("%.3f", round(count($exc)/ count($grades),2,PHP_ROUND_HALF_UP));
If you need more info about that take a look at sprintf PHP documentation here http://it2.php.net/manual/en/function.sprintf.php .
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