Rank points based off the highest number in a row - php

Question

I have a table called "member_points", which is set up like this:
|----|-------|----------|------------------------|
| id | uid | points | last_loggedin |
|----|-------|----------|------------------------|
| 1 | 1 | 5075 | 2012-08-02 02:04:00 |
|----|-------|----------|------------------------|
| 2 | 2 | 2026 | 2012-08-04 02:15:02 |
|----|-------|----------|------------------------|
I have a function below. I want the function to echo or return the rank like "Ranked #1" or "Ranked #2", based on the number in the row "points".
function getTopRanks($id) {
$sql = "SELECT MAX(points) AS toppoints FROM member_points";
$r = mysql_query($sql);
if ( $r !== false && mysql_num_rows($r) > 0 ) {
while ( $a = mysql_fetch_assoc($r) ) {
$points = stripslashes($a['toppoints']);
return ''.$points.'';
}
}
}
Can someone help me make this possible?

Answer 1

I think you are going to ranking user on the basis of points.
For such type of problem, i suggest you to first rank user on DESC order. Then pickup desire value form row.
function getTopRanks($id) {
$sql = "SELECT uid FROM member_points ORDER BY points DESC ";
$r = mysql_query($sql);
if ( $r !== false && mysql_num_rows($r) > 0 ) {
while ( $a = mysql_fetch_assoc($r) ) {
$points = stripslashes($a['toppoints']);
return ''.$points.'';
}
}
}
this will solve your problem.:)
UPDATE AS YOUR REQUIREMENTS:
function getTopRanksUser($id) {
$userPos ="Ranked position is:";
$count = 0;
$sql = "SELECT uid FROM member_points ORDER BY points DESC ";
$r = mysql_query($sql);
if ( $r !== false && mysql_num_rows($r) > 0 ) {
while ( $a = mysql_fetch_assoc($r) ) {
$count = $count+1;
$userPosCount = $userPos+$count;
return $userPosCount;
}
}
}
there should be return userPos+count. because count is increases up number of rows in table and the string ranked position is always remains same.
this will give result. Your can change return string according to your requirements. :)
thanks.

Answer 2

In your mysql query use ORDER BY (http://dev.mysql.com/doc/refman/5.0/en/sorting-rows.html)
so your query would become
SELECT points FROM member_points ORDER BY points DESC
this will sort the results from the query by the amount of points. (DESC will make them descending and ASC will make the result ascending).

Answer 3

Here's what I use for my rankings ... this code also takes into account ties and displays correctly. Just change "username" and "points" to your appropriate column names in your db and set the db connection vars: $hostName $databaseNanme $username and $password for you connection.
Hope this helps!
$sql1 = "SET #rnk=0; SET #rank=0; SET #scount=0;";
$sql2 = "SELECT username, points, rank FROM
(
SELECT AA.*,BB.username, points
(#rnk:=#rnk+1) rnk,
(#rank:=IF(#scount=points,#rank,#rnk)) rank,
(#scount:=points) newscount
FROM
(
SELECT * FROM
(SELECT COUNT(1) scorecount,points
FROM users GROUP BY points
) AAA
ORDER BY points DESC
) AA LEFT JOIN users BB USING (points)) A;";
try {
$conn = new PDO('mysql:host='.$hostName.';dbname='.$databaseName, $username, $password);
$conn->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
$conn->query($sql1);
$data = $conn->query($sql2);
$standings = $data->fetchAll(PDO::FETCH_ASSOC);
} catch(PDOException $e) {
error_log( 'ERROR: ' . $e->getMessage() );
}
print_r($standings);