시간차 질문 채택완료

</p><p><span class="pun"><td class=mw_basic_list_datetime>
   
          function format_interval(DateInterval $interval) {
           $result = "";
                if ($interval->y) { $result .= $interval->format("%y years "); }
                if ($interval->m) { $result .= $interval->format("%m months "); }
                if ($interval->d) { $result .= $interval->format("%d days "); }
                if ($interval->h) { $result .= $interval->format("%h 시간 "); }
                if ($interval->i) { $result .= $interval->format("%i 분 "); }
                if ($interval->s) { $result .= $interval->format("%s 초 "); }
              return $result;
             }</span></p><p><span class="pun">           $first_date  = new DateTime($list[$i][wr_10]);
           $second_date  = new DateTime($list[$i][wr_datetime]);</span></p><p><span class="pun">           $difference = $first_date->diff($second_date);</span></p><p><span class="pun">           echo format_interval($difference);
           ?>  </span></td>
   ​</span></p><p>