/**
 * Created by PhpStorm.
 * User: Administrator
 * Date: 2015/5/19
 * Time: 18:03
 */
date_default_timezone_set('Asia/Shanghai');
$n = time() - 86400 * date('N', time());
echo "上周二:";
echo date('Y-m-d', $n - 86400 * 4 );
echo '  本周三 ：';
echo date('Y-m-d', $n+86400 * 2);