PHP时间函数-获取指定日期上个月的第一天和最后一天

/**
 * by hkshadow
 * Enter description here ...
 * @param 1 or 30 $i
 */
function GetPurMonth($date) { //获取指定日期上个月的第一天和最后一天
    $time = strtotime ( $date );
    $firstday = date ( 'Y-m-01', strtotime ( date ( 'Y', $time ) . '-' . (date ( 'm', $time ) - 1) . '-01' ) );
    $lastday = date ( 'Y-m-d', strtotime ( "$firstday +1 month -1 day" ) );
    return array ($firstday, $lastday );
}

/**
 * by hkshadow
 * Enter description here ...
 * @param 1 or 30 $i
 */
function GetNextMonth($date) { //获取指定日期下个月的第一天和最后一天
    $arr = getdate ();
    if ($arr ['mon'] == 12) {
        $year = $arr ['year'] + 1;
        $month = $arr ['mon'] - 11;
        $day = $arr ['mday'];
        if ($day < 10) {
            $mday = '0' . $day;
        } else {
            $mday = $day;
        }
        $firstday = $year . '-0' . $month . '-01';
        $lastday = $year . '-0' . $month . '-' . $mday;
    } else {
        $time = strtotime ( $date );
        $firstday = date ( 'Y-m-01', strtotime ( date ( 'Y', $time ) . '-' . (date ( 'm', $time ) + 1) . '-01' ) );
        $lastday = date ( 'Y-m-d', strtotime ( "$firstday +1 month -1 day" ) );
    }
    return array ($firstday, $lastday );
}

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