比较多维数组中的元素 [英] Comparing elements in a multidimensional array

问题描述

说我有一个多维数组.例如:

Say i have a multidimensional array. For example:

 Array ( 
         [0] => Array ( 
             [animal_id] => 5494 
             [animal_name] => "Suzy"
             [animal_type] => "zebra" 
             [animal_location] => 0 
             [animal_awake] => 1
             [animal_age] => 3 ) 
         [1] => Array ( 
             [animal_id] => 5494 
             [animal_name] => "Joshua"
             [animal_type] => "panda"
             [animal_location] => 5
             [animal_awake] => 0
             [animal_age] => 8 )
        [2] => Array ( 
             [animal_id] => 5494 
             [animal_name] => "Debra"
             [animal_type] => "snake" 
             [animal_location] => 7 
             [animal_awake] => 1
             [animal_age] => 3 ) 
        [3] => Array ( 
             [animal_id] => 5495 
             [animal_name] => "Caleb"
             [animal_type] =>  "zebra"
             [animal_location] => 0
             [animal_awake] => 1
             [animal_age] => 3 ) 
        [4] => Array ( 
             [animal_id] => 5495 
             [animal_name] => "Joshua"
             [animal_type] =>  "panda"
             [animal_location] => 5 
             [animal_awake] => 0
             [animal_age] => 8 )    
        [5] => Array ( 
             [animal_id] => 5495 
             [animal_name] => "Debra"
             [animal_type] =>  "snake"
             [animal_location] => 7 
             [animal_awake] => 1
             [animal_age] => 3 ) 
        [6] => Array ( 
             [animal_id] => 5496 
             [animal_name] => "Emily"
             [animal_type] =>  "zebra"
             [animal_location] => 0
             [animal_awake] => 1
             [animal_age] => 3 ) 
        [7] => Array ( 
             [animal_id] => 5496 
             [animal_name] => "Joshua"
             [animal_type] =>  "panda"
             [animal_location] => 5 
             [animal_awake] => 0
             [animal_age] => 8 )    
        [8] => Array ( 
             [animal_id] => 5496 
             [animal_name] => "Debra"
             [animal_type] =>  "snake"
             [animal_location] => 7 
             [animal_awake] => 1
             [animal_age] => 3 )             
         )

我想将所有蛇与蛇，所有熊猫与熊猫等(而不是蛇与熊猫)进行比较，并将唯一元素放入一个数组(将所有唯一元素放入一个数组)，我将如何去做.由于它们是数组中的元素，因此我有些困惑.另外，我不会事先知道会有多少种不同的类型.例如，有一次我可以通过一个包含熊猫，熊，蛇的多维数组-下次我可以通过一个包含Bird，Cat，Panda和Zebra的数组.

And i want to compare all the snakes against the snakes, and all the panda's against the panda's etc (but not a snake against a panda) and put the unique elements into an array(all unique elements into a single array), how would i go about doing this. Since they are elements within an array, i'm a bit stumped. Also, i won't know in advance how many different types there will be. For instance, one time i could be passed an multidimensional array with Panda, Bear, Snake -- Next time i could be passed an array with Bird, Cat, Panda, Zebra.

有什么想法吗?

最终输出

      Array ( 
     [0] => Array ( 
         [animal_id] => 5494 
         [animal_name] => "Suzy"
         [animal_type] => "zebra" 
         [animal_location] => 0 
         [animal_awake] => 1
         [animal_age] => 3 ) 
     [1] => Array ( 
         [animal_id] => 5494 
         [animal_name] => "Joshua"
         [animal_type] => "panda"
         [animal_location] => 5
         [animal_awake] => 0
         [animal_age] => 8 )
    [2] => Array ( 
         [animal_id] => 5495 
         [animal_name] => "Caleb"
         [animal_type] =>  "zebra"
         [animal_location] => 0
         [animal_awake] => 1
         [animal_age] => 3 )    
    [3] => Array ( 
         [animal_id] => 5495 
         [animal_name] => "Debra"
         [animal_type] =>  "snake"
         [animal_location] => 7 
         [animal_awake] => 1
         [animal_age] => 3 ) 
    [4] => Array ( 
         [animal_id] => 5496 
         [animal_name] => "Emily"
         [animal_type] =>  "zebra"
         [animal_location] => 0
         [animal_awake] => 1
         [animal_age] => 3 )    

     )

推荐答案

数组键必须是唯一的，因此请充分利用它.

Array keys must be unique, so lets use that to our advantage.

function get_animal_key($animal) {
    return $animal['animal_type'] . '-' . $animal['animal_name'];
}

$uniques = array();
foreach ($array as $animal) {
    $key = get_animal_key($animal);
    $uniques[$key] = $animal;
}

var_export($uniques);

给出以下数组

array (
  'zebra-Suzy' => 
  array (
    'animal_id' => 5494,
    'animal_name' => 'Suzy',
    'animal_type' => 'zebra',
    'animal_location' => 0,
    'animal_awake' => 1,
    'animal_age' => 3,
  ),
  'panda-Joshua' => 
  array (
    'animal_id' => 5496,
    'animal_name' => 'Joshua',
    'animal_type' => 'panda',
    'animal_location' => 5,
    'animal_awake' => 0,
    'animal_age' => 8,
  ),
  'snake-Debra' => 
  array (
    'animal_id' => 5496,
    'animal_name' => 'Debra',
    'animal_type' => 'snake',
    'animal_location' => 7,
    'animal_awake' => 1,
    'animal_age' => 3,
  ),
  'zebra-Caleb' => 
  array (
    'animal_id' => 5495,
    'animal_name' => 'Caleb',
    'animal_type' => 'zebra',
    'animal_location' => 0,
    'animal_awake' => 1,
    'animal_age' => 3,
  ),
  'zebra-Emily' => 
  array (
    'animal_id' => 5496,
    'animal_name' => 'Emily',
    'animal_type' => 'zebra',
    'animal_location' => 0,
    'animal_awake' => 1,
    'animal_age' => 3,
  ),
)

如您所见，这将动物的类型和名称作为唯一标识符.您的问题并未说明是什么使动物与众不同，因此请更改上面的内容以适合您的需求.

As you can see, this takes the animal's type and name as the unique identifiers. Your question did not state what makes an animal unique, so alter the above to suit your needs.

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