php日期范围

php

function timeto($time, $case = 1)
{
    $Y = date('Y', $time);
    $m = date('m', $time);
    $d = date('d', $time);
    $z = date('z', $time);
    $z++;
    switch ($case) {
        case 1: // 天
            $last_start = mktime(0, 0, 0, 1, $z - 1, $Y);
            $cur_start = mktime(0, 0, 0, 1, $z, $Y);
            $next_start = mktime(0, 0, 0, 1, $z + 1, $Y);
            break;
        case 2: // 周
            $N = date('N', $time);
            $z = $z - $N + 1;
            $last_start = mktime(0, 0, 0, 1, $z - 7, $Y);
            $cur_start = mktime(0, 0, 0, 1, $z, $Y);
            $next_start = mktime(0, 0, 0, 1, $z + 7, $Y);
            break;
        case 3:
            $j = date('j', $time); // 当前月份第几天
            $cur_month_days = date('t', $time);
            $last_month_days = date('t', mktime(0, 0, 0, $m - 1, $d, $Y));
            $z = $z - $j + 1;
            $last_start = mktime(0, 0, 0, 1, $z - $last_month_days, $Y);
            $cur_start = mktime(0, 0, 0, 1, $z, $Y);
            $next_start = mktime(0, 0, 0, 1, $z + $cur_month_days, $Y);
            break;
        case 4:
            $j = date('j', $time); // 当前月份第几天
            $cur_months_days = date('t', $time)
                + date('t', mktime(0, 0, 0, $m + 1, $d, $Y))
                + date('t', mktime(0, 0, 0, $m + 2, $d, $Y));
            $last_months_days = date('t', mktime(0, 0, 0, $m - 3, $d, $Y))
                + date('t', mktime(0, 0, 0, $m - 2, $d, $Y))
                + date('t', mktime(0, 0, 0, $m - 1, $d, $Y));
            $z = $z - $j + 1; // 当前月第一天
            $last_start = mktime(0, 0, 0, 1, $z - $last_months_days, $Y);
            $cur_start = mktime(0, 0, 0, 1, $z, $Y);
            $next_start = mktime(0, 0, 0, 1, $z + $cur_months_days, $Y);
            break;
        default:
            return false;
    }
    return [
        'cur' => [
            'start' => $cur_start,
            'end' => $next_start - 1
        ],
        'last' => [
            'start' => $last_start,
            'end' => $cur_start - 1
        ],
    ];
}