PHP Method to Sort a Key in a Two-Dimensional Array

This article example explains how to sort a specific key of a two-dimensional array in PHP. Shared for everyone's reference, as follows:

/**
 * Sort the query result set
 * @access public
 * @param array $list Query results
 * @param string $field Name of the field to sort by
 * @param string $sortby Sorting type (asc for ascending order, desc for reverse order, nat for natural order)
 * @return array
 */
  function list_sort_by($list, $field, $sortby = 'asc')
  {
    if (is_array($list))
    {
      $refer = $resultSet = array();
      foreach ($list as $i => $data)
      {
        $refer[$i] = &$data[$field];
      }
      switch ($sortby)
      {
        case 'asc': // Ascending sorting
          asort($refer);
          break;
        case 'desc': // Reverse sorting
          arsort($refer);
          break;
        case 'nat': // Natural sorting
          natcasesort($refer);
          break;
      }
      foreach ($refer as $key => $val)
      {
        $resultSet[] = &$list[$key];
      }
      return $resultSet;
    }
    return false;
  }
/**
 * Example
 * Question: How to sort the id key of a two-dimensional array in descending order (that is, the larger the id, the earlier it is placed)?
 */
$list = array(
  0 => array(
    'id' => 1,
    'name' => 'First'
  ,
  1 => array(
    'id' => 3,
    'name' => 'Third'
  ,
  2 => array(
    'id' => 2,
    'name' => 'Second'
  ,
  3 => array(
    'id' => 4,
    'name' => 'Fourth'
  ,
);
//Answer
$new_list = list_sort_by($list, 'id', 'desc');
print_r($new_list);

Running results are as follows:

Array
(
  [0] => Array
    (
      [id] => 4
      [name] => Fourth
    )
  [1] => Array
    (
      [id] => 3
      [name] => Third
    )
  [2] => Array
    (
      [id] => 2
      [name] => Second
    )
  [3] => Array
    (
      [id] => 1
      [name] => First
    )
)

More about PHP-related content, readers who are interested can view the special topic of this site: 《PHP Array (Array) Operation Skills大全》、《PHP Basic Syntax Tutorial》、《PHP Operation and Operator Usage Summary》、《PHP Object-Oriented Program Design Tutorial》、《PHP Network Programming Skills Summary》、《PHP String (string) Usage Summary》、《php+MySQL Database Operation Tutorial》and《PHP Common Database Operation Skills Summary}

I hope this article will be helpful to everyone in PHP program design.

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