Create a Multidimensional Array and json_encode - php

Question

I have to get a JSON response from the database:
id and last_active:
$users = array();
$stmt = $mysqli->query('SELECT id, last_active FROM users WHERE status = 1');
while ($row = $stmt->fetch_assoc()) {
$users[]['id'] = $row['id'];
$users[]['last_active'] = $row['last_active'];
}
echo json_encode($users);
The array must be as follows:
$users = array (
0 => array(1, 1522921015),
1 => array(2, 1522921019),
2 => array(3, 1522921102),
3 => array(4, 1522921195),
4 => array(5, 1522921034)
);
How to properly build the multidimensional array with the query result?

Answer 1

Try this code
$users = array();
$stmt = $mysqli->query('SELECT id, last_active FROM users WHERE status = 1');
$i=0;
while ($row = $stmt->fetch_assoc()) {
$users[$i]['id'] = $row['id'];
$users[$i]['last_active'] = $row['last_active'];
$i++;
}
echo json_encode($users);

Answer 2

You can use temporary array like this:
$users = array();
$stmt = $mysqli->query('SELECT id, last_active FROM users WHERE status = 1');
while ($row = $stmt->fetch_assoc()) {
$tempArray = []; // added
$tempArray[] = $row['id'];
$tempArray[] = $row['last_active'];
$users[] = $tempArray; // added
}
echo json_encode($users);
or directly assign both values :
$users[] = array($row['id'],$row['last_active']);

Answer 3

Remove json_encode just print $user

Answer 4

You should push an array without keys to get the expected data:
$users = array();
$stmt = $mysqli->query('SELECT id, last_active FROM users WHERE status = 1');
while ($row = $stmt->fetch_assoc()) {
$users[] = [ $row['id'], $row['last_active'] ];
}
So, $users will be equals to:
$users = array (
0 => array(1, 1522921015),
1 => array(2, 1522921019),
2 => array(3, 1522921102),
3 => array(4, 1522921195),
4 => array(5, 1522921034)
);
Or, using the MYSQLI_NUM options with fetch_array():
while ($row = $stmt->fetch_array(MYSQLI_NUM)) {
$users[] = $row;
}

Answer 5

my choise will be like this:
$users = array();
$stmt = $mysqli->query('SELECT id, last_active FROM users WHERE status = 1');
while ($row = $stmt->fetch_assoc()) {
$users[] = [
$row['id'],
$row['last_active'],
];
}
echo json_encode($users);