PHP：分選multidimensionnal陣列具有非恆定的數字鍵

Question

在PHP的，我有這種類型的數組（抱歉大的例子，但它是一個特定的排序）：

[0] => Array 
    (
     [title] => 1 
     [desc] => 2 
    ) 
[1] => Array 
    (
     [title] => 1 
     [desc] => 3 
    ) 
[2] => Array 
    (
     [title] => 1 
     [desc] => 2 
     [content] => 10 
    ) 
[3] => Array 
    (
     [title] => 1 
     [desc] => 2 
     [content] => 11 
    ) 
[4] => Array 
    (
     [title] => 1 
     [desc] => 3 
     [content] => 9 
    ) 
[5] => Array 
    (
     [title] => 1 
     [desc] => 2 
     [content] => 10 
     [tag] => 'foo' 
    ) 
[6] => Array 
    (
     [title] => 1 
     [desc] => 2 
     [content] => 10 
     [tag] => 'bar' 
    ) 

而且我想這樣的輸出：

[0] => Array 
    (
     [title] => 1 
     [desc] => 2 
    ) 
[1] => Array 
    (
     [title] => 1 
     [desc] => 2 
     [content] => 10 
    ) 
[2] => Array 
    (
     [title] => 1 
     [desc] => 2 
     [content] => 10 
     [tag] => 'bar' 
    ) 
[3] => Array 
    (
     [title] => 1 
     [desc] => 2 
     [content] => 10 
     [tag] => 'foo' 
    ) 
[4] => Array 
    (
     [title] => 1 
     [desc] => 2 
     [content] => 11 
    ) 
[5] => Array 
    (
     [title] => 1 
     [desc] => 3 
    ) 
[6] => Array 
    (
     [title] => 1 
     [desc] => 3 
     [content] => 9 
    ) 

而且偏偏array_multisort()無法排序與非恆定的數字鍵的排列：它只是忽略了所有的數組... 任何想法？

Answer 1

這裏是排序的示例代碼：

function cmp ($a, $b) { 
    if ($a['desc'] == $b['desc']) { 
    if (!isset($a['content']) && !isset($b['content'])) { 
     return 0; 
    } 
    else if (!isset($a['content'])) { 
     return -1; 
    } 
    else if (!isset($b['content'])) { 
     return 1; 
    } 
    else { 
     if ($a['content'] == $b['content']) { 
     if (!isset($a['tag'])) { 
      return -1; 
     } 
     else if (!isset($b['tag'])) { 
      return 1; 
     } 
     else { 
      if ($a['tag'] == $b['tag']) { 
      return 0; 
      } 
      else if ($a['tag'] < $b['tag']) { 
      return -1; 
      } 
      else { 
      return 1; 
      } 
     } 
     return 0; 
     } 
     else if ($a['content'] < $b['content']) { 
     return -1; 
     } 
     else { 
     return 1; 
     } 
    } 
    return 0; 
    } 
    else if ($a['desc'] < $b['desc']) { 
    return -1; 
    } 
    else { 
    return 1; 
    } 
} 
usort($array, 'cmp'); 

感謝@Nelson，@therefromhere和@xdazz把我的usort() :)

Answer 2

我不清楚你要訂購什麼標準，但你可以使用usort，你提供了一個定義比較的函數。

Answer 3

可以使用usort具有量身定製功能cmp爲您的特殊需求，如下面的代碼：

usort($arr, "cmp"); 

function cmp($a, $b) { 
    $array = array('title','desc','content','tag'); 
    foreach ($array as &$ar) { 
     $ai = isset($a[$ar]); 
     $bi = isset($b[$ar]); 
     if ($ai && !$bi) { 
      return 1; 
     } 
     if ($bi && !$ai) { 
      return -1; 
     } 
     if (!$bi) { 
      return 0; 
     } 
     if ($a[$ar] > $b[$ar]) { 
      return 1; 
     } 
     if ($b[$ar] > $a[$ar]) { 
      return -1; 
     } 
    } 
    return 0; 
} 

應該做你想做的。