代码片段1-时间

$res_time=$end_time-$start_time;
switch ($res_time) {
	case $res_time <= 60 :
		if ($res_time < 0)
			$res_time = 3;
		$res_time .= '秒';
		break;
	case $res_time > 60 && $res_time <= 3600 :
		$res_time = floor ( $res_time / 60 );
		$res_time .= '分钟';
		break;
	case $res_time > 3600 && $res_time <= 3600 * 24 :
		$res_time = floor ( $res_time / 3600 );
		$res_time .= '小时';
		break;
	case $res_time > 3600 && $res_time <= 3600 * 24 * 30:
		$res_time = floor ( $res_time / 3600 * 24 );
		$res_time .= '天';
		break;
	default :
		$res_time = floor ( $res_time / 3600 * 24 );
		$res_time = 'N天';
		break;	
}
//////////
if ($view_type == 1) {
		$today = strtotime ( date ( 'Y-m-d', time () ) );
		$time = $today - 3600 * 24 * 7;
		$where = "and answertime >= $time";
		$viewtypecn = '本周';
	} elseif ($view_type == 2) {
		$today = strtotime ( date ( 'Y-m-d', time () ) );
		$time = $today - 3600 * 24 * 30;
		$where = "and answertime >= $time";
		$viewtypecn = '本月';
	} else {
		$where = '';
		$viewtypecn = '最新';
	}