tp5.1中返回当天、昨天、当月等的开始和结束时间戳

/**
 * 返回今日开始和结束的时间戳
 *
 * @return array
 */
function today()
{
    list($y, $m, $d) = explode('-', date('Y-m-d'));
    return [
        mktime(0, 0, 0, $m, $d, $y),
        mktime(23, 59, 59, $m, $d, $y)
    ];
}

/**
 * 返回昨日开始和结束的时间戳
 *
 * @return array
 */
function yesterday()
{
    $yesterday = date('d') - 1;
    return [
        mktime(0, 0, 0, date('m'), $yesterday, date('Y')),
        mktime(23, 59, 59, date('m'), $yesterday, date('Y'))
    ];
}

/**
 * 返回本月开始和结束的时间戳
 *
 * @return array
 */
function month()
{
    list($y, $m, $t) = explode('-', date('Y-m-t'));
    return [
        mktime(0, 0, 0, $m, 1, $y),
        mktime(23, 59, 59, $m, $t, $y)
    ];
}

/**
 * 返回上个月开始和结束的时间戳
 *
 * @return array
 */
function lastMonth()
{
    $y = date('Y');
    $m = date('m');
    $begin = mktime(0, 0, 0, $m - 1, 1, $y);
    $end = mktime(23, 59, 59, $m - 1, date('t', $begin), $y);

    return [$begin, $end];
}
/**
 * 返回本年开始和结束的时间戳
 */
function year(){
    return [
        mktime(0, 0, 0, 1, 1, date('Y')),
        mktime(23, 59, 59, 12, 31, date('Y'))
    ];
}

/**
 * 返回去年开始和结束的时间戳
 *
 * @return array
 */
function lastYear()
{
    $year = date('Y') - 1;
    return [
        mktime(0, 0, 0, 1, 1, $year),
        mktime(23, 59, 59, 12, 31, $year)
    ];
}

/**
 * 返回本周开始和结束的时间戳
 *
 * @return array
 */
function week()
{
    list($y, $m, $d, $w) = explode('-', date('Y-m-d-w'));
    if($w == 0) $w = 7; //修正周日的问题
    return [
        mktime(0, 0, 0, $m, $d - $w + 1, $y), mktime(23, 59, 59, $m, $d - $w + 7, $y)
    ];
}

/**
 * 获取某月第一天和最后一天
 *
 * @return array
 */
function getOneMonthTime($year,$month){
    $date = $year.'-'.$month;
    return [
        date('Y-m-d', mktime(00, 00, 00, date('m', strtotime($date)), 01)),
        date('Y-m-d', mktime(23, 59, 59, date('m', strtotime($date))+1, 00))
    ];
}

更多：https://www.kancloud.cn/manual/thinkphp5_1/354132