对PHP数组进行排序、分组和计数

Question

我是一个从事代码点火项目的设计师，我被这个问题卡住了！

我有这个数组

Array
(
     [Science] => 7
[War] => 5
[Mystery] => 2
[Preview Only] => 2
[Conspiracy,News ] => 2
[Drugs,Educational,Lifestyle,Society] => 1
[Educational,Nature,Science,Space] => 1
[Religion,Society] => 1
[Music] => 1
[Movies,Music] => 1
[Lifestyle] => 1
[Countries,Educational,History,War] => 1
[Educational,Society] => 1
[Science,Space,Technology] => 1
[Economics,Educational,Lifestyle,Society] => 1
[Society] => 1
[Biology,Conference,Educational] => 1
[Human Rights,Society] => 1
[Art and Artists,Biographies,Music] => 1
[Biology,Educational,Science] => 1
[Activist,Biology,Science,Society] => 1
[Countries,Drugs,War] => 1
[Drugs,War] => 1
[Technology,War] => 1
[History,War] => 1
[Biology,Educational,Environment,Nature,Science] => 1
[Science,Technology] => 1
[Educational,Science,Space] => 1
[Educational,History,Human Rights,War] => 1
[Environment] => 1
[Biographies] => 1
[Evolution,Science] => 1
[Art and Artists] => 1
)

正如您在那里看到的，它已经按数字排序。我想要实现的是从数组中删除任何重复的类别，并为每个类别添加一个+1，结果如下：

Array
(
[Science] => 14
[War] => 11
[Mystery] => 2
[Preview Only] => 2
[Conspiracy] => 2
[Society] => 4
[Nature] => 1
[space] => 1
[Religion] => 1
[Music] => 2
[Movies] => 1
[Lifestyle] => 1
[Countries] => 1
[Educational] => 12
[Space] => 1
[Lifestyle] => 1
[Society] => 3
[Biology] => 3
[Economics] => 1
[Science] => 1
[Activist] => 1
[Countries] => 1
[Drugs] => 3
[Technology] => 2
[History] => 1
[Biology] => 1
[Technology] => 1
[Space] => 1
[History] => 1
[Human Rights] => 
[Environment] => 1
[Biographies] => 2
    [Evolution] => 1
    [Art and Artists] => 1
)   

这些示例并不完全匹配，但您可以看到我想要实现的目标。谢谢大家！

Answer 1

您可以使用array_keys()获取第一个数组的键，使用explode()去掉逗号，然后，如果explode提供了多个元素，则检查该元素是否存在，并按1递增，或者创建一个新元素。

这是第一个版本，甚至没有经过测试：

   $array1 = array(); // The array you show
   $array2 = array(); // The resulting array

   $keys = array_keys($array1);
   foreach($keys as $key)
   {
        $chunks = explode(',', $key);
        foreach($chunks as $chunk)
        {
             if(isset($array2[$chunk]))
                 $array[$chunk] += $array1[$key];
             else
                 $array[$chunk] = $array1[$key];
        }
    }

Answer 2

function do_the_magic( $array ){
 $result = array();
 foreach ($array as $k=>$value){
  foreach (explode(',',$k) as $category){
   $result[$category] += $value;
  }
 }
 return $result;
}

示例：

$a['ala,ma']=1;
$a['ala']=2;
print_r(do_the_magic($a));

结果：

Array ( 
 [ala] => 3 
 [ma] => 1 
)

Answer 3

尝试如下所示：

$result = array();
foreach($data as $str_keys => $value) {
    $keys = explode(',', $str_keys);
    foreach($keys as $key) {
        if(isset($result[$key])) {
            $result[$key] += $value;
        } else {
            $result[$key] = $value;
        }
    }
}

print_r($result);