Question

I have this table in MySql db:

After running this query:

SELECT score, count(*) FROM Coaches group by score ORDER BY score DESC

The result table look like this:

Now in php I try to fetch the result and iterate through the array to determine which group each coach belongs to and get his place in the ranking. Therefore I wrote this:

$groupsOfScoresQuery = "SELECT score, count(*) FROM Coaches group by score ORDER BY score DESC";

$result = mysqli_query($dbc, $groupsOfScoresQuery);

if ($result) {  // query did successfully run
$response['topCoaches'] = array();

    if (mysqli_num_rows($result) > 0)   {   
        while ( $rowScore = mysqli_fetch_array($result, MYSQLI_ASSOC) ) {

            $currentRanking++;
            $score = array(); // temp user array for one group of scores
            $numberOfCoaches; // Number of coaches with this particular number of scores
            $scoresGroup; // Scores in the particular group

            $score["scores"] = $rowScore["score"];
            $score["count"] = $rowScore["count(*)"];
            $numberOfCoaches = $score["count"];
            $scoresGroup = $score["scores"];

            $response["scoresGroup"] = $scoresGroup; // HERE IS THE PROBLEM

.
.
.
more processing
} // end WHILE

Why $response["scoresGroup"] will always conatins the last value from the result? In this case this is 123. I thought that this is the first iteration through the loop and $response["scoresGroup"] wll hold first element (474), during the second iteration should hold 382 ? What I’m doing wrong here? Do I use correct function to fetch result? or should I use different loop to acheive my goal? Thanks for the help in advance.

Answer 1

You did not post the expected structure of $response; here is what I think you are trying to do:

while ($rowScore = mysqli_fetch_array($result, MYSQLI_ASSOC)) {
    $response["scoresGroup"][] = array(
        "scores" => $rowScore["score"],
        "count" => $rowScore["count(*)"]
    );
}
// $response["scoresGroup"][0]["scores"] = 474
// $response["scoresGroup"][0]["count"]  = 1
// $response["scoresGroup"][1]["scores"] = 382
// $response["scoresGroup"][1]["count"]  = 1
// $response["scoresGroup"][2]["scores"] = 123
// $response["scoresGroup"][2]["count"]  = 1

Or perhaps:

while ($rowScore = mysqli_fetch_array($result, MYSQLI_ASSOC)) {
    $response["scoresGroup"][$rowScore["score"]] = $rowScore["count(*)"]
}
// $response["scoresGroup"][474] = 1
// $response["scoresGroup"][382] = 1
// $response["scoresGroup"][123] = 1