How to sort a two-dimensional array by a certain key in PHP

This article mainly introduces the method of sorting a certain key of a two-dimensional array in PHP, involving PHP's operation skills for array traversal, comparison, sorting and other related operations. Friends in need can refer to the following

for details As follows:

/**
 * 对查询结果集进行排序
 * @access public
 * @param array $list 查询结果
 * @param string $field 排序的字段名
 * @param string $sortby 排序类型 （asc正向排序 desc逆向排序 nat自然排序）
 * @return array
 */
  function list_sort_by($list, $field, $sortby = 'asc')
  {
    if (is_array($list))
    {
      $refer = $resultSet = array();
      foreach ($list as $i => $data)
      {
        $refer[$i] = &$data[$field];
      }
      switch ($sortby)
      {
        case 'asc': // 正向排序
          asort($refer);
          break;
        case 'desc': // 逆向排序
          arsort($refer);
          break;
        case 'nat': // 自然排序
          natcasesort($refer);
          break;
      }
      foreach ($refer as $key => $val)
      {
        $resultSet[] = &$list[$key];
      }
      return $resultSet;
    }
    return false;
  }
/**
 * 例子
 * 求：根据二维数组的id键值降序排列（也就是id越大的排在越前）？
 */
$list = array(
  0 => array(
    'id' => 1,
    'name' => '第一'
  ),
  1 => array(
    'id' => 3,
    'name' => '第三'
  ),
  2 => array(
    'id' => 2,
    'name' => '第二'
  ),
  3 => array(
    'id' => 4,
    'name' => '第四'
  ),
);
//解答
$new_list = list_sort_by($list, 'id', 'desc');
print_r($new_list);

The running results are as follows:

Array
(
  [0] => Array
    (
      [id] => 4
      [name] => 第四
    )
  [1] => Array
    (
      [id] => 3
      [name] => 第三
    )
  [2] => Array
    (
      [id] => 2
      [name] => 第二
    )
  [3] => Array
    (
      [id] => 1
      [name] => 第一
    )
)

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