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  1. <?php
  2. /*
  3.     http://q...content-available-to-author-only...e.jp/1377925282
  4. */
  5. $day = array(
  6.     '2013-08-30',
  7.     '2013-08-31',
  8.     '2013-09-01',
  9.     '2013-09-02',
  10.     '2013-09-05',
  11.     '2013-09-06',
  12.     '2013-09-10',
  13.     '2013-09-30',
  14.     '2013-10-01',
  15.     '2013-10-02',
  16.     '2014-01-01',
  17.     '2014-12-30',
  18.     '2014-12-31',
  19.     '2015-01-01',
  20. );
  21.  
  22. function format_date($t, $prev) {
  23.     $local_t = localtime($t, true);
  24.     $local_prev = localtime($prev, true);
  25.     $fmt = 'Y年n月j日';
  26.     if ($local_t['tm_year'] == $local_prev['tm_year']) {
  27.         $fmt = 'n月j日';
  28.         if ($local_t['tm_mon'] == $local_prev['tm_mon']) {
  29.             $fmt = 'j日';
  30.         }
  31.     }
  32.     return date($fmt, $t);
  33. }
  34.  
  35.  
  36. $t_prev = strtotime($day[0]);
  37. $t_start = $t_end = $t_prev;
  38. $t_end_prev = strtotime("1970-4-1");
  39. $output = '';
  40. $sep = '';
  41.  
  42. $n = count($day);
  43. for ($i = 1 ; $i <= $n ; $i++) {
  44.     if ($i != $n) {
  45.         $t = strtotime($day[$i]);
  46.         $diff = $t - $t_prev;
  47.         if ($diff == 24*60*60) {
  48.             $t_end = $t;
  49.             $t_prev = $t;
  50.             continue;
  51.         }
  52.     }
  53.  
  54.     $output .= $sep . format_date($t_start, $t_end_prev);
  55.     if ($t_start != $t_end) {
  56.         $output .= '～' . format_date($t_end, $t_start);
  57.     }
  58.  
  59.     $t_end_prev = $t_end;
  60.     $t_start = $t_end = $t;
  61.     $t_prev = $t;
  62.     $sep = '、';
  63. }
  64.  
  65. echo $output;
  66.  
  67. ?>
  68.  
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2013年8月30日～9月2日、5日～6日、10日、30日～10月2日、2014年1月1日、12月30日～2015年1月1日
https://ideone.com/9KRnZQ
language:
PHP (php 7.3.5)
created:
10 years ago
visibility:
secret

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