PHP获取本周所有日期或者最近七天所有日期

/**
 * 获取本周所有日期
 */
function get_week($time = '', $format='Y-m-d'){
    $time = $time != '' ? $time : time();
    //获取当前周几
    $week = date('w', $time);
    $date = [];
    for ($i=1; $i<=7; $i++){
        $date[$i] = date($format ,strtotime( '+' . $i-$week .' days', $time));
    }
    return $date;
}

print_r(get_week());

Array
(
    [1] => 2018-06-18
    [2] => 2018-06-19
    [3] => 2018-06-20
    [4] => 2018-06-21
    [5] => 2018-06-22
    [6] => 2018-06-23
    [7] => 2018-06-24
)

/**
 * 获取最近七天所有日期
 */
function get_weeks($time = '', $format='Y-m-d'){
    $time = $time != '' ? $time : time();
    //组合数据
    $date = [];
    for ($i=1; $i<=7; $i++){
        $date[$i] = date($format ,strtotime( '+' . $i-7 .' days', $time));
    }
    return $date;
}

print_r(get_weeks());

Array
(
    [1] => 2018-06-13
    [2] => 2018-06-14
    [3] => 2018-06-15
    [4] => 2018-06-16
    [5] => 2018-06-17
    [6] => 2018-06-18
    [7] => 2018-06-19
)