Fetching the result array from mysql query in php, while loop issue - php

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

Answer 2

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

Answer 3

Looking at the description of your question, you need to define a multidimensional array for storing all the results from query resultset.
Please refer the below code snippet
$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; //Notice the array here
.
.
.
more processing
} // end WHILE

Answer 4

You are settings $response['scoresGroup'] each time you run the loop, so at the end, it will contain only the last element. Try changing the variable you put the data into on each loop.
$x++;
$response['scoresGroup' . x] = $scoresGroup;