/**
* 获取当前时间上一周的开始时间和结束时间，可以通过配置一周的开始时间，默认为星期一
* @param
* $begin 上一周开始时间的变量名称；
* $end 上一周结束时间的变量名称；
* $week_start_num 一周的开始时间，默认为周一
* $now_time 当前时间，这里做一个当前时间方便测试该方法的正确性
* @return array()
* @author leeyi
/**
 * 获取当前时间上一周的开始时间和结束时间，可以通过配置一周的开始时间，默认为星期一 
 * @param 
 *        $begin 上一周开始时间的变量名称； 
 *        $end 上一周结束时间的变量名称；
 *        $week_start_num 一周的开始时间，默认为周一
 *        $now_time 当前时间，这里做一个当前时间方便测试该方法的正确性
 * @return array() 
 * @author leeyi 
 * @spec 
 *        使用方法，执行 
 *        extract(get_lastweek('beginlastweek','endlastweek')); 
 *         之后，可以直接使用 $beginlastweek $endlastweek 两个变量；
 *         如果需要其他变量名称，可以修改参数 $begin 和 $end ，自行指定名称
 * @end
 */
function get_lastweek($begin='beginlastweek',$end='endlastweek',$week_start_num=1, $now_time='') {
    $now_time         = $now_time>0 ? $now_time : time();
    $now_weekday    = date('w', $now_time); // 获取当前是星期前 0-6 星期日-星期六
    $week_start_num = in_array($week_start_num, array('0','1','2','3','4','5','6')) ? $week_start_num : 1; // 默认一周开始时间为周一
    $now_weekday     = $now_weekday    //php获取上周起始时间戳和结束时间戳
    $beginlastweek    = $now_time-($now_weekday+7-$week_start_num)*86400;
    $endlastweek    = $beginlastweek+(6*86400);
     echo date('y-m-d',$now_time).' : '.date('y-m-d 00:00:00', $beginlastweek).' => '.date('y-m-d 23:59:59', $endlastweek).'
'; // for test
    return array(
            $begin     => strtotime(date('y-m-d 00:00:00', $beginlastweek)),
            $end     => strtotime(date('y-m-d 23:59:59', $endlastweek))
        );
}下面是测试代码 ：get_lastweek($begin='beginlastweek',$end='endlastweek',$week_start_num=0, strtotime('2015-03-22'));
        get_lastweek($begin='beginlastweek',$end='endlastweek',$week_start_num=0, strtotime('2015-03-23'));
        get_lastweek($begin='beginlastweek',$end='endlastweek',$week_start_num=0, strtotime('2015-03-24'));
        get_lastweek($begin='beginlastweek',$end='endlastweek',$week_start_num=0, strtotime('2015-03-25'));
        get_lastweek($begin='beginlastweek',$end='endlastweek',$week_start_num=0, strtotime('2015-03-26'));
        get_lastweek($begin='beginlastweek',$end='endlastweek',$week_start_num=0, strtotime('2015-03-27'));
        get_lastweek($begin='beginlastweek',$end='endlastweek',$week_start_num=0, strtotime('2015-03-28'));
        get_lastweek($begin='beginlastweek',$end='endlastweek',$week_start_num=0, strtotime('2015-03-29'));
        echo '';
        get_lastweek($begin='beginlastweek',$end='endlastweek',$week_start_num=1, strtotime('2015-03-22'));
        get_lastweek($begin='beginlastweek',$end='endlastweek',$week_start_num=1, strtotime('2015-03-23'));
        get_lastweek($begin='beginlastweek',$end='endlastweek',$week_start_num=1, strtotime('2015-03-24'));
        get_lastweek($begin='beginlastweek',$end='endlastweek',$week_start_num=1, strtotime('2015-03-25'));
        get_lastweek($begin='beginlastweek',$end='endlastweek',$week_start_num=1, strtotime('2015-03-26'));
        get_lastweek($begin='beginlastweek',$end='endlastweek',$week_start_num=1, strtotime('2015-03-27'));
        get_lastweek($begin='beginlastweek',$end='endlastweek',$week_start_num=1, strtotime('2015-03-28'));
        get_lastweek($begin='beginlastweek',$end='endlastweek',$week_start_num=1, strtotime('2015-03-29'));
        echo '';
        get_lastweek($begin='beginlastweek',$end='endlastweek',$week_start_num=2, strtotime('2015-03-22'));
        get_lastweek($begin='beginlastweek',$end='endlastweek',$week_start_num=2, strtotime('2015-03-23'));
        get_lastweek($begin='beginlastweek',$end='endlastweek',$week_start_num=2, strtotime('2015-03-24'));
        get_lastweek($begin='beginlastweek',$end='endlastweek',$week_start_num=2, strtotime('2015-03-25'));
        get_lastweek($begin='beginlastweek',$end='endlastweek',$week_start_num=2, strtotime('2015-03-26'));
        get_lastweek($begin='beginlastweek',$end='endlastweek',$week_start_num=2, strtotime('2015-03-27'));
        get_lastweek($begin='beginlastweek',$end='endlastweek',$week_start_num=2, strtotime('2015-03-28'));
        get_lastweek($begin='beginlastweek',$end='endlastweek',$week_start_num=2, strtotime('2015-03-29'));
        exit();浏览器输出结果：
2015-03-22 : 2015-03-15 00:00:00 => 2015-03-21 23:59:59
2015-03-23 : 2015-03-15 00:00:00 => 2015-03-21 23:59:59
2015-03-24 : 2015-03-15 00:00:00 => 2015-03-21 23:59:59
2015-03-25 : 2015-03-15 00:00:00 => 2015-03-21 23:59:59
2015-03-26 : 2015-03-15 00:00:00 => 2015-03-21 23:59:59
2015-03-27 : 2015-03-15 00:00:00 => 2015-03-21 23:59:59
2015-03-28 : 2015-03-15 00:00:00 => 2015-03-21 23:59:59
2015-03-29 : 2015-03-22 00:00:00 => 2015-03-28 23:59:59
2015-03-22 : 2015-03-09 00:00:00 => 2015-03-15 23:59:59
2015-03-23 : 2015-03-16 00:00:00 => 2015-03-22 23:59:59
2015-03-24 : 2015-03-16 00:00:00 => 2015-03-22 23:59:59
2015-03-25 : 2015-03-16 00:00:00 => 2015-03-22 23:59:59
2015-03-26 : 2015-03-16 00:00:00 => 2015-03-22 23:59:59
2015-03-27 : 2015-03-16 00:00:00 => 2015-03-22 23:59:59
2015-03-28 : 2015-03-16 00:00:00 => 2015-03-22 23:59:59
2015-03-29 : 2015-03-16 00:00:00 => 2015-03-22 23:59:59
2015-03-22 : 2015-03-10 00:00:00 => 2015-03-16 23:59:59
2015-03-23 : 2015-03-10 00:00:00 => 2015-03-16 23:59:59
2015-03-24 : 2015-03-17 00:00:00 => 2015-03-23 23:59:59
2015-03-25 : 2015-03-17 00:00:00 => 2015-03-23 23:59:59
2015-03-26 : 2015-03-17 00:00:00 => 2015-03-23 23:59:59
2015-03-27 : 2015-03-17 00:00:00 => 2015-03-23 23:59:59
2015-03-28 : 2015-03-17 00:00:00 => 2015-03-23 23:59:59
2015-03-29 : 2015-03-17 00:00:00 => 2015-03-23 23:59:59 ad：真正免费，域名+虚机+企业邮箱=0元