Flot with json and php - php

Question

I made a json array with php. It works but it gives only the 'data' result from the first label and not the rest. Beside that it starts everytime with a number. How can i fix this?
$sql = $site->mysqli->query("SELECT id, title, event_start_date FROM events");
while($row = $sql->fetch_assoc()) {
$dataset[] = array('label' => $row['title']);
$sql2 = $site->mysqli->query("SELECT timestamp, event_id, COUNT(timestamp) AS row_count FROM order_products WHERE event_id = '".$row['id']."' GROUP BY DATE(FROM_UNIXTIME(timestamp))");
$count2 = $sql2->num_rows;
while($row2 = $sql2->fetch_assoc()) {
$dataset['data'][] = array(intval($row2['timestamp'] * 1000), (int)$row2['row_count']);
}
}
$results[]=$dataset;
die(Json_encode($results));
Result:
[{"0":{"label":"Label 1"},"data":[[1392894348000,10],
[1392998502000,3],[1393066962000,5],[1393262541000,3],
[1393577348000,5],[1393704543000,2],[1393780878000,1],
[1393882353000,3],"1":{"label":"Label 2"},"2":{"label":"Label 3"}}]

Answer 1

You should empty your $dataset for each event:
$sql = $site->mysqli->query("SELECT id, title, event_start_date FROM events");
while($row = $sql->fetch_assoc()) {
$dataset = array('label' => $row['title'], 'data' => array());
$sql2 = $site->mysqli->query("SELECT timestamp, event_id, COUNT(timestamp) AS row_count FROM order_products WHERE event_id = '".$row['id']."' GROUP BY DATE(FROM_UNIXTIME(timestamp))");
$count2 = $sql2->num_rows;
while($row2 = $sql2->fetch_assoc()) {
$dataset['data'][] = array(intval($row2['timestamp'] * 1000), (int)$row2['row_count']);
}
$results[]=$dataset;
}
die(json_encode($results));