function dateMonths()
{
global $mysqli;
$query2 = "SELECT
camps.id,
camps.names
,avg(campsrating.rating) as Average
FROM camps
LEFT JOIN campsrating ON
camps.id = campsrating.camp_id
WHERE datas BETWEEN '2020-01-14' AND '2020-12-21'";
$result = mysqli_query($mysqli, $query2);
while ($row = mysqli_fetch_assoc($result))
print_r($row);
}