Question

我有一个看起来像这样的对象数组，请注意，create_time已通过MYSQL对它们进行了排序：

array (size=5)
  0 => 
    object(stdClass)[38]
      public 'vacancy_id' => int 5
      public 'title' => string 'test title' (length=10)
      public 'create_time' => string '2018-10-05 11:15:34' (length=19)
      public 'language_iso' => string 'NL' (length=2)
  1 => 
    object(stdClass)[42]
      public 'vacancy_id' => int 9
      public 'title' => string 'test title 5' (length=12)
      public 'create_time' => string '2018-08-05 11:15:34' (length=19)
      public 'language_iso' => string 'EN' (length=2)
  2 => 
    object(stdClass)[40]
      public 'vacancy_id' => int 7
      public 'title' => string 'test title 3' (length=12)
      public 'create_time' => string '2018-08-05 11:15:34' (length=19)
      public 'language_iso' => string 'FR' (length=2)
  3 => 
    object(stdClass)[39]
      public 'vacancy_id' => int 6
      public 'title' => string 'test title 2' (length=12)
      public 'create_time' => string '2018-06-05 11:15:34' (length=19)
      public 'language_iso' => string 'FR' (length=2)
  4 => 
    object(stdClass)[41]
      public 'vacancy_id' => int 8
      public 'title' => string 'test title 4' (length=12)
      public 'create_time' => string '2018-02-05 11:15:34' (length=19)
      public 'language_iso' => string 'NL' (length=2)

在我的页面上，我正在实现排序功能。（目前）有4种排序选项：

通过create_time（这也是MySQL中的默认排序方式。我一直想保持这种排序方式。）
通过NL语言iso
通过FR语言iso
通过EN语言iso

在上面给出的数组示例中，假设我要按“ FR语言iso”进行排序。这意味着我希望我的结果集如下所示：

array (size=5)
  0 => 
    object(stdClass)[40]
      public 'vacancy_id' => int 7
      public 'title' => string 'test title 3' (length=12)
      public 'create_time' => string '2018-08-05 11:15:34' (length=19)
      public 'language_iso' => string 'FR' (length=2)
  1 => 
    object(stdClass)[39]
      public 'vacancy_id' => int 6
      public 'title' => string 'test title 2' (length=12)
      public 'create_time' => string '2018-06-05 11:15:34' (length=19)
      public 'language_iso' => string 'FR' (length=2)
  2 => 
    object(stdClass)[38]
      public 'vacancy_id' => int 5
      public 'title' => string 'test title' (length=10)
      public 'create_time' => string '2018-10-05 11:15:34' (length=19)
      public 'language_iso' => string 'NL' (length=2)
  3 => 
    object(stdClass)[42]
      public 'vacancy_id' => int 9
      public 'title' => string 'test title 5' (length=12)
      public 'create_time' => string '2018-08-05 11:15:34' (length=19)
      public 'language_iso' => string 'EN' (length=2)
  4 => 
    object(stdClass)[41]
      public 'vacancy_id' => int 8
      public 'title' => string 'test title 4' (length=12)
      public 'create_time' => string '2018-02-05 11:15:34' (length=19)
      public 'language_iso' => string 'NL' (length=2)

因此在此示例中，结果必须包含：

结果以language_iso FR开头，但仍在其中，按create_time排序
带有language_iso EN和NL的结果位于FR结果的下方，但也包含在其中，按create_time排序

我一直在使用PHP的usort函数中的自定义函数完全空白。

Answer 1

您可以（也许应该）完全从MySQL处理此排序要求：

SELECT vacancy_id, title, create_time, language_iso
FROM yourTable
ORDER BY
    IF(language_iso = 'FR', 0, 1),
    create_time;

上面的ORDER BY子句将首先覆盖法语记录，其次是所有其他语言，而create_time则是第二步的排序。

虽然可以尝试对PHP中的给定数组/结果集进行排序，但实际上您可能希望始终查询，因为基础数据可能会过时。

通过字符串值

1 个答案: