Jonathan Clark Jonathan Clark -4 years ago 87
PHP Question

How to calculate average on star rating system?

I am developing a star rating system with 1-5 stars.
In my database I am saving them like this:

$stars_1 = 1;
$stars_2 = 6;
$stars_3 = 3;
$stars_4 = 11;
$stars_5 = 22;

$total_votes = 43


When a user votes using for example 3 stars I update stars_3 with 1 and total_votes with 1.
Then I need to calculate the average rating (stars).

I do it like this right now but I is not working (result seems wrong):

(($stars_1 + $stars_2 + $stars_3 + $stars_4 + $stars_4) / $total_votes);

Answer Source

Needs to be like this:

($stars_1 + $stars_2 * 2 + $stars_3 * 3 + $stars_4 * 4 + $stars_5 * 5) / $total_votes;
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