Question

如何使用php将数组＃1转换为数组＃2结构？

第一个数组是生物列表上的数据库查询结果，每个生物体都按其顺序，族，属，种进行分类。 Hierarchical Species是各种属的子分类，Genus分类是各种家庭的子分类等。

在命名空间术语中，您可以这样阅读：

索引[0]的项目---＆gt; Hemiptera.Miridae.Kanakamiris
索引[1]的项目---＆gt; Hemiptera.Miridae.Neophloeobia.incisa

数组＃1的键之间存在一种父/子关系，如下所示：

'Rank_Order'值是'Rank_Family'值的父级
'Rank_Family'值是'Rank_Genus'值的父级
'Rank_Genus'值是'Rank_Species'值的父级

阵列＃1：

Array
(
    [0] => Array
        (
            ['Rank_Order'] => 'Hemiptera'
            ['Rank_Family'] => 'Miridae'
            ['Rank_Genus'] => 'Kanakamiris'
            ['Rank_Species'] => ''
        )   
    [1] => Array
        (
            ['Rank_Order'] => 'Hemiptera'
            ['Rank_Family'] => 'Miridae'
            ['Rank_Genus'] => 'Neophloeobia'
            ['Rank_Species'] => 'incisa'
        )
    [2] => Array
        (
            ['Rank_Order'] => 'Hemiptera'
            ['Rank_Family'] => 'Noridae'
            ['Rank_Genus'] => 'Canelbia'
            ['Rank_Species'] => 'Arissa'
        )
)

以下数组是我需要的数组结构：阵列＃2：

Array(
    [name]     => 'Hemiptera'
    [children] => Array(

        [0] => Array(
            [name]     => 'Miridae'
            [children] => Array(

                [0] => Array(
                    [name]     => 'Kanakamiris'
                    [children] => Array(
                    )
                )
                [1] => Array(
                    [name]     => 'Neophloeobia'
                    [children] => Array(

                        [0] => Array(
                            [name] => 'incisa'
                            [children] => Array(
                            )
                        )
                    )
                )
            )
        )
        [1] => Array(
            [name]     => 'Noridae'
            [children] => Array(

                [0] => Array(
                    [name]     => 'Canelbia'
                    [children] => Array(

                        [0] => Array(
                            [name] => 'Arissa'
                            [children] => Array(
                            )
                        )
                    )
                )
            )
        )
    )
)

我在堆栈溢出中看到类似的问题，但在我的情况下无法使用它们。例如。 php-reorder-array-to-reflect-parent-id-hierarchy

Answer 1

我认为这对于非常大的数组来说不会超级高效，但它适用于您的场景（here's a sample）。

 $array = ...
 $levels = array('Rank_Order', 'Rank_Family', 'Rank_Genus', 'Rank_Species');

 function get_children($parent, $lev, $orig, $levels){
     if($lev + 1 > count($levels)){
          return array();
     }

     $seen = array();
     $children = array();
     foreach($orig as $node){
         if($node[$levels[$lev]] == $parent && !in_array($node[$levels[$lev+1]], $seen)){
             $seen[] = $node[$levels[$lev+1]];
             $children[] = get_children($node[$levels[$lev+1]], $lev+1, $orig, $levels);
         }
     }
     return array('name' => $parent, 'children' => $children);
 }

 function hier($orig, $levels){
     $seen = array();
     $result = array();
     foreach($orig as $node){
         if(!in_array($node[$levels[0]], $seen)){
              $seen[] = $node[$levels[0]];
              $result[] = get_children($node[$levels[0]], 0, $orig, $levels);
         }
     }
     return $result;
 }

 print_r($array);
 print_r(hier($array, $levels));

将php数组重新排列为嵌套的分层数组

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