Calculate average from array with fmod() - development

Calculate average from array with fmod()

I have a ratings array in which there are list of ratings of particular product from where i want the result to be average rating.

What i want to achieve is if average rating is 4.2 or 4.3 or something in between 4 to 4.5 it should result as 4.5 and if average rating is like 4.6 or 4.7 or something it should result as 5 rating.

I have done below stuff which is resulting 4.5 still if average rating os 4.2 or 4.6.

$product_ratings = Array
                  (
                     [0] => stdClass Object
                     (
                        [id] => 93
                        [product_id] => 5
                        [rating] => 5
                        [user_id] => 154
                     )
                     [1] => stdClass Object
                     (
                        [id] => 93
                        [product_id] => 5
                        [rating] => 5
                        [user_id] => 154
                     )
                     [2] => stdClass Object
                     (
                        [id] => 93
                        [product_id] => 5
                        [rating] => 3.5
                        [user_id] => 154
                     )
                     [3] => stdClass Object
                     (
                        [id] => 93
                        [product_id] => 5
                        [rating] => 5
                        [user_id] => 154
                     )
                     [4] => stdClass Object
                     (
                        [id] => 93
                        [product_id] => 5
                        [rating] => 2.5
                        [user_id] => 154
                     )
                     [5] => stdClass Object
                     (
                        [id] => 93
                        [product_id] => 5
                        [rating] => 4.5
                        [user_id] => 154
                     )
                   )
                $r = 0;
                $rating_total="";
                foreach ($product_ratings as $row) {
                    $rating_total += $row->rating;
                    $r++;
                }
                $average_rating = "";     
                if($rating_total != "" || $rating_total != 0)
                {
                    $average_rating = $rating_total / $r;
                }
                else
                {
                    $average_rating = 0;
                }
                $avg_rating = $average_rating - fmod($average_rating, 0.5);
                echo $avg_rating

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