Update statement in MYSQL from PHP - php

Question

I have a table as shown below
The output from said table
Green, is where a winner has been announced, whereas yellow means they have submitted a report, but a winner hasn't been decided yet. (winner field not populated)
$roundBound = Array();
$query = "SELECT MIN(id), MAX(id) FROM $tablename GROUP BY round";
if($result = $Login->mysqli->query($query)) {
while ($row = $result->fetch_row()) {
$roundBound[] = $row[0];
$roundBound[] = $row[1];
}
}
for($i = 0; $i < count($roundBound); $i = $i + 2) {
$match = 0;
for($j = $roundBound[$i]; $j < $roundBound[$i + 1]; $j = $j + 2) {
$id1 = $j;
$id2 = $j+1;
$query = "SELECT t1.winner, t2.winner FROM $tablename as t1, $tablename as t2 WHERE t1.id=$id1 AND t2.id=$id2";
$result = $Login->mysqli->query($query);
$row = $result->fetch_row();
$win1 = $row[0];
$win2 = $row[1];
if (isset($win1) && isset($win2)) {
if (isset($roundBound[$i + 2])) {
$id = $roundBound[$i + 2] + $match;
$query = "UPDATE $tablename SET
username = '$win1',
username2 = '$win2'
WHERE id = $id";
$Login->mysqli->query($query);
} else {
//Tourneydonneee yeeee
}
}
$match++;
}
}
Does anyone have a improvement, or an all-around different idea? This will be running quite often and could be potentially running on large record sets, so optimization would also be welcome.

Answer 1

as far as i understand you problem, i can suggest you to try
for ($i = 0; $i < count($arr); $i = $i + 2) {
$win1 = mysql_query("SELECT winner FROM tableName WHERE id=".(int)$i);
$win2 = mysql_query("SELECT winner FROM tableName WHERE id=".(int)$i+1);
$qry = "INSERT INTO tableName SET
username = $win1,
username2 =$win2,
....";
mysql_query($qry);
}