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Can't access first record in array


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#1 ehmer

ehmer
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Posted 06 March 2006 - 06:47 AM

Hi

I have almost completed an online football tipping competition.

I have a list of records retrieved from a database that are displayed in a table showing points for each round for each user and a running season total. Some calculations are made on the data in the query and in the returned record set in the PHP code.

A paragraph is displayed just before the table to indicate to the current user what position they hold. So if a user has some successful selections they will receive a message like this:

"--current user--, you are currently in position 10 out of 250 players on the tipping ladder."

If the user has no correct selections to date they will receive this message:

"--current user--, you currently don't have a ranking as you haven't scored any points in the tipping competition yet."

The table displays fine and the appropriate messages are returned with one exception. The user sitting in the top position in the table receives the 2nd message above rather than " ... you are currently in position 1 out of ..."

Not sure what is going on here. The relevant code is detailed below.

Appreciate any thoughts about what is going wrong here and how to overcome it.

thanks, David

QUERY:

SELECT tips.username, fixtures.round,
SUM(CASE
WHEN tips.tip='draw' AND fixtures.result='draw' then 1
WHEN tips.tip=fixtures.result then 1
ELSE 0 end) points
FROM fixtures
JOIN tips on (fixtures.round=tips.round AND fixtures.game=tips.game)
GROUP BY tips.username, fixtures.round
LIMIT 0,50

CODE

$userPoints = array();
while ($row = mysql_fetch_assoc($result)) {
$userPoints[$row['username']][$row['round']] = $row['points'];
$userPoints[$row['username']]['total'] += $row['points'];
}

function mysort ($a, $b) {
return ($a['total'] == $b['total'] ? 0 : ($a['total'] > $b['total'] ? -1 : 1));
}

uasort ($userPoints, "mysort");

// determine position of current user in relation to all players
list($pos) = array_keys(array_keys($userPoints), $valid_user);
if (!$pos) {
echo "<p><strong>'$valid_user'</strong>, you currently don't have a ranking as you haven't scored any points in the tipping competition yet.";
}
else {
$pos = $pos + 1;
$number_of_players = count($userPoints);
echo "<p><strong>'$valid_user'</strong>, you are currently in position <strong>".$pos."</strong> out of <strong>".$number_of_players."</strong> players on the tipping ladder.</p>";
}

foreach($userPoints as $username => $rounds) {
echo "<tr>";
echo "<td>".$username."</td>";
for($i = 1; $i < 27; $i++) {
echo "<td>".($rounds[$i] ? $rounds[$i] : "-")."</td>";
}
echo "<td><strong>".$rounds['total']."</strong></td>";
echo "</tr>";
}
echo "</table>";

#2 wickning1

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Posted 06 March 2006 - 08:00 AM

PHP arrays start at 0. 0 evaluates to FALSE.

do this:
list($pos) = array_keys(array_keys($userPoints), $valid_user);
if ($pos == "0" || $pos) $pos++;


#3 ehmer

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Posted 06 March 2006 - 12:35 PM

Thanks wickning1

That fixed it up. Appreciate your help.

David




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