How to split an array of dates into groups by week?

Question

PHP

I have an array of dates

$array = [0 = > ['date' => unixDate, 'param' => 'val'], ..]

How can I group items by week? those. get an array of the form
$res = ['week1' => [], ..]

Answer 1

function splitByWeek($dots) {
    $splitted = [];

    foreach ($dots as $dot) {
        $week = date("YW", $dot['date']);
        $splitted[$week][] = $dot;
    }

    return $splitted;
}