PHP 使用多优先级对多数组进行排序 - php sorting multi arrays with multi priority

php sorting multi arrays with multi priority

本文关键字：数组排序多优先级 PHP | 更新日期: 2023-09-27

我有 N 个数组（例如 3 个数组）：

$arr1 = array(0 => array('id' => 34, 'score' => 440),
          1 => array('id' => 32, 'score' => 140),
          2 => array('id' => 22, 'score' => 121),
          3 => array('id' => 99, 'score' => 532)
    );
$arr2 = array(0 => array('id' => 32, 'score' => 213),
          1 => array('id' => 34, 'score' => 354),
          2 => array('id' => 22, 'score' => 674)
    );
$arr3 = array(0 => array('id' => 34, 'score' => 10),
          1 => array('id' => 22, 'score' => 449),
          2 => array('id' => 99, 'score' => 586),
          3 => array('id' => 32, 'score' => 113),
          4 => array('id' => 16, 'score' => 777)
    );

我想根据（id）和（score）对这些（N）数组进行排序，但我想优先考虑所有数组中出现的重复 id，然后优先考虑最大分数的第二优先级，结果将是（1）过滤的唯一数组，根据这些排序规则保存唯一 ID。

我尝试使用 php usort 函数来传递比较函数，但我未能完成这项工作。

如果数据源来自 mysql 数据库，则可以通过简单的 sql 查询轻松检索此自定义排序。

但是，如果我们必须直接使用数组，那么这也应该有效：（很抱歉编码肮脏和移动性差。

$all_arrays = array_merge( $arr1, $arr2, $arr3 ); // merge all arrays into one
$items = $ascores = $scores = $occurs = $sorted_ids = array();
foreach( $all_arrays as $elem ) {
    if(isset($occurs[ $elem['id'] ])) { $occurs[ $elem['id'] ]++; } else { $occurs[ $elem['id'] ] = 1; }
    if( ! isset($ascores[ $elem['id'] ]) || $elem['score'] > max( $ascores[ $elem['id'] ] ) ) { 
        $ascores[ $elem['id'] ][] = $elem['score']; 
        $scores[ $elem['id'] ] = $elem['score']; 
    }
    $items[ $elem['id'] ] = array( 'id'=>$elem['id'], 'maxs'=>$scores[ $elem['id'] ], 'occs'=>$occurs[ $elem['id'] ] );
}
array_multisort( $occurs, SORT_DESC, $scores, SORT_DESC, $items);
/// print_r( $items ); // $items holds unique sorted data. outputs: Array ( [0] => Array ( [id] => 22 [maxs] => 674 [occs] => 3 ) [1] => Array ( [id] => 34 [maxs] => 440 [occs] => 3 ) [2] => Array ( [id] => 32 [maxs] => 213 [occs] => 3 ) [3] => Array ( [id] => 99 [maxs] => 586 [occs] => 2 ) [4] => Array ( [id] => 16 [maxs] => 777 [occs] => 1 ) )
foreach( $items as $item ) $sorted_ids[] = $item['id'];
/// print_r( $sorted_ids ); // $sorted_ids holds your desired ids list. outputs: Array ( [0] => 22 [1] => 34 [2] => 32 [3] => 99 [4] => 16 )