按子數組排序多維數組

Question

我有以下數組，我試圖按比分排序，然後匹配，然後名稱，但我的方法不工作。任何人都能看到爲什麼

最終順序應該是4，3，5，

的usort我用的是在底部。

 [3] => Array 
      (
       [name] => DrayTek Vigor 2130Vn VoIP/WiFi Router 
       [matches] => Array 
        (
         [0] => voip 
        ) 
       [score] => 3 
      ) 
     [4] => Array 
      (
       [name] => DrayTek Vigor 2750n VDSL Wireless Router 
       [matches] => Array 
        (
         [0] => 2750 
        ) 
       [score] => 3 
      ) 
     [5] => Array 
      (
       [name] => DrayTek Vigor 2850Vn VDSL/ADSL VoIP Router 
       [matches] => Array 
        (
         [0] => voip 
        ) 
       [score] => 3 
      ) 

邏輯

1. all have the same score, so no change in order 
2. 4 has 2750 in matches[0] which assuming numbers come before letters, moves 4 up 
** the order now should be 4,3,5 
3. as 3 and 5 have the same matches[], no change in order 
4. 3's name naturally comes before 5 but since its already above, no change 
** final order should be 4,3,5 

排序結果，得分最高的第一個，接着匹配數組，然後命名

function cmp($a, $b) 
{ 
    if ($a['score'] < $b['score']) 
     return 1; 
    elseif ($a['score'] > $b['score']) 
     return -1; 
    elseif (! array_diff($a['matches'], $b['matches'])) 
     return 1; 
    elseif (! array_diff($b['matches'], $a['matches'])) 
     return -1; 
    elseif (($c = strnatcmp(strtolower($a['name']), strtolower($b['name']))) !== 0) 
     return $c; 
    else 
     return 0; 
} 
usort($this->results['rows'], "cmp"); 

Answer 1

你似乎有逆轉了比賽陣列比較的感覺（你回來1，如果它們相等，而不是返回0 /讓它通過下一個測試）。因爲你需要一個明確的秩序時，他們不相等，也許你應該排序的匹配數組的長度：

function cmp($a, $b) 
{ 
    # sort by score 
    $result = $b['score'] - $a['score']; 

    # then by number of matches 
    if ($result == 0) { 
     $result = count($b['matches']) - count($a['matches']); 
    } 

    # if they have the same number of matches but different matches, who wins? 
    if ($result == 0) { 
     $result = strnatcasecmp($a['name'], $b['name']); 
    } 

    return $result; 
} 

的問題array_diff是，它返回一個單一的陣列。你將這個結果與a和b的排序進行比較是什麼？比較函數需要能夠排列任何兩個項目，而不需要其他任何上下文。

Answer 2

找到了解決辦法

function cmp($a, $b) 
{ 
    if ($a['score'] < $b['score']) 
     return 1; 

    if ($a['score'] > $b['score']) 
     return -1; 

    if (count($a['matches']) > count($b['matches'])) 
     return 1; 

    if (count($a['matches']) < count($b['matches'])) 
     return -1; 

    natsort($a['matches']); natsort($b['matches']); 

    for ($i = 0; $i < count($a['matches']); $i++) 
    { 
     if (($c = strnatcasecmp($b['matches'][$i], $a['matches'][$i])) !== 0) 
      return $c; 
    } 

    if (($c = strnatcasecmp(strtolower($a['name']), strtolower($b['name']))) !== 0) 
     return $c; 

    return 0; 
} 

usort($this->results['rows'], "cmp");