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从数组列表创建数组树

发布于 2024-10-02 13:47:48 字数 632 浏览 0 评论 0原文

我有一个像这样的列表：

array(
  array(id=>100, parentid=>0, name=>'a'),
  array(id=>101, parentid=>100, name=>'a'),
  array(id=>102, parentid=>101, name=>'a'),
  array(id=>103, parentid=>101, name=>'a'),
)

但是更大，所以我需要一种有效的方法将其变成像这样的树状结构：

array(
  id=>100, parentid=>0, name=>'a', children=>array(
    id=>101, parentid=>100, name=>'a', children=>array(
      id=>102, parentid=>101, name=>'a',
      id=>103, parentid=>101, name=>'a',
    )
  )
)

我不能使用嵌套集之类的东西或类似的东西，因为我可以在数据库中添加左右值。 有什么想法吗？

原文

i have a list like this:

array(
  array(id=>100, parentid=>0, name=>'a'),
  array(id=>101, parentid=>100, name=>'a'),
  array(id=>102, parentid=>101, name=>'a'),
  array(id=>103, parentid=>101, name=>'a'),
)

but way bigger so i need a efficient way to make this into a tree like structure like this:

array(
  id=>100, parentid=>0, name=>'a', children=>array(
    id=>101, parentid=>100, name=>'a', children=>array(
      id=>102, parentid=>101, name=>'a',
      id=>103, parentid=>101, name=>'a',
    )
  )
)

i cannot use things like nested set or things like that becoas i can add left and right values in my database.
any ideas?

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评论（9）

凉世弥音 2024-10-09 13:47:48

好吧，这就是我解决它的方法：

$arr = array(
  array('id'=>100, 'parentid'=>0, 'name'=>'a'),
  array('id'=>101, 'parentid'=>100, 'name'=>'a'),
  array('id'=>102, 'parentid'=>101, 'name'=>'a'),
  array('id'=>103, 'parentid'=>101, 'name'=>'a'),
);

$new = array();
foreach ($arr as $a){
    $new[$a['parentid']][] = $a;
}
$tree = createTree($new, array($arr[0]));
print_r($tree);

function createTree(&$list, $parent){
    $tree = array();
    foreach ($parent as $k=>$l){
        if(isset($list[$l['id']])){
            $l['children'] = createTree($list, $list[$l['id']]);
        }
        $tree[] = $l;
    } 
    return $tree;
}

oke this is how i solved it:

$arr = array(
  array('id'=>100, 'parentid'=>0, 'name'=>'a'),
  array('id'=>101, 'parentid'=>100, 'name'=>'a'),
  array('id'=>102, 'parentid'=>101, 'name'=>'a'),
  array('id'=>103, 'parentid'=>101, 'name'=>'a'),
);

$new = array();
foreach ($arr as $a){
    $new[$a['parentid']][] = $a;
}
$tree = createTree($new, array($arr[0]));
print_r($tree);

function createTree(&$list, $parent){
    $tree = array();
    foreach ($parent as $k=>$l){
        if(isset($list[$l['id']])){
            $l['children'] = createTree($list, $list[$l['id']]);
        }
        $tree[] = $l;
    } 
    return $tree;
}
回复 原文
春花秋月 2024-10-09 13:47:48

如果您需要超过 1 个parentid[0] 元素，请进行小修复:)

$arr = array(
  array('id'=>100, 'parentid'=>0, 'name'=>'a'),
  array('id'=>101, 'parentid'=>100, 'name'=>'a'),
  array('id'=>102, 'parentid'=>101, 'name'=>'a'),
  array('id'=>103, 'parentid'=>101, 'name'=>'a'),
);

$new = array();
foreach ($arr as $a){
    $new[$a['parentid']][] = $a;
}
$tree = createTree($new, $new[0]); // changed
print_r($tree);

function createTree(&$list, $parent){
    $tree = array();
    foreach ($parent as $k=>$l){
        if(isset($list[$l['id']])){
            $l['children'] = createTree($list, $list[$l['id']]);
        }
        $tree[] = $l;
    } 
    return $tree;
}

small fix if you need more than 1 parentid[0] element :)

$arr = array(
  array('id'=>100, 'parentid'=>0, 'name'=>'a'),
  array('id'=>101, 'parentid'=>100, 'name'=>'a'),
  array('id'=>102, 'parentid'=>101, 'name'=>'a'),
  array('id'=>103, 'parentid'=>101, 'name'=>'a'),
);

$new = array();
foreach ($arr as $a){
    $new[$a['parentid']][] = $a;
}
$tree = createTree($new, $new[0]); // changed
print_r($tree);

function createTree(&$list, $parent){
    $tree = array();
    foreach ($parent as $k=>$l){
        if(isset($list[$l['id']])){
            $l['children'] = createTree($list, $list[$l['id']]);
        }
        $tree[] = $l;
    } 
    return $tree;
}
回复 原文
︶￣淡然 2024-10-09 13:47:48

Thunderstriker 的变体的又一重做 - 所有逻辑都在一个函数中：

/**
 * @param array $flatList - a flat list of tree nodes; a node is an array with keys: id, parentID, name.
 */
function buildTree(array $flatList)
{
    $grouped = [];
    foreach ($flatList as $node){
        $grouped[$node['parentID']][] = $node;
    }

    $fnBuilder = function($siblings) use (&$fnBuilder, $grouped) {
        foreach ($siblings as $k => $sibling) {
            $id = $sibling['id'];
            if(isset($grouped[$id])) {
                $sibling['children'] = $fnBuilder($grouped[$id]);
            }
            $siblings[$k] = $sibling;
        }
        return $siblings;
    };

    return $fnBuilder($grouped[0]);
}

// Example:
$flat = [
    ['id' => 100, 'parentID' => 0, 'name' => 'root'],
    ['id' => 101, 'parentID' => 100, 'name' => 'ch-1'],
    ['id' => 102, 'parentID' => 101, 'name' => 'ch-1-1'],
    ['id' => 103, 'parentID' => 101, 'name' => 'ch-1-2'],
];

$tree = buildTree($flat, 'parentID', 'id');
echo json_encode($tree, JSON_PRETTY_PRINT);

Playground：https://www.tehplayground.com/Ap4uUuwHWl9eiJIx

One more rework of Thunderstriker's variant - all the logic in one function:

/**
 * @param array $flatList - a flat list of tree nodes; a node is an array with keys: id, parentID, name.
 */
function buildTree(array $flatList)
{
    $grouped = [];
    foreach ($flatList as $node){
        $grouped[$node['parentID']][] = $node;
    }

    $fnBuilder = function($siblings) use (&$fnBuilder, $grouped) {
        foreach ($siblings as $k => $sibling) {
            $id = $sibling['id'];
            if(isset($grouped[$id])) {
                $sibling['children'] = $fnBuilder($grouped[$id]);
            }
            $siblings[$k] = $sibling;
        }
        return $siblings;
    };

    return $fnBuilder($grouped[0]);
}

// Example:
$flat = [
    ['id' => 100, 'parentID' => 0, 'name' => 'root'],
    ['id' => 101, 'parentID' => 100, 'name' => 'ch-1'],
    ['id' => 102, 'parentID' => 101, 'name' => 'ch-1-1'],
    ['id' => 103, 'parentID' => 101, 'name' => 'ch-1-2'],
];

$tree = buildTree($flat, 'parentID', 'id');
echo json_encode($tree, JSON_PRETTY_PRINT);

Playground: https://www.tehplayground.com/Ap4uUuwHWl9eiJIx

回复 原文
谁人与我共长歌 2024-10-09 13:47:48

这是我对亚瑟的重做的改编：

/* Recursive branch extrusion */
function createBranch(&$parents, $children) {
    $tree = array();
    foreach ($children as $child) {
        if (isset($parents[$child['id']])) {
            $child['children'] =
                $this->createBranch($parents, $parents[$child['id']]);
        }
        $tree[] = $child;
    } 
    return $tree;
}

/* Initialization */
function createTree($flat, $root = 0) {
    $parents = array();
    foreach ($flat as $a) {
        $parents[$a['parent']][] = $a;
    }
    return $this->createBranch($parents, $parents[$root]);
}

使用：

$tree = createTree($flat);

Here is my adaptation from arthur's rework:

/* Recursive branch extrusion */
function createBranch(&$parents, $children) {
    $tree = array();
    foreach ($children as $child) {
        if (isset($parents[$child['id']])) {
            $child['children'] =
                $this->createBranch($parents, $parents[$child['id']]);
        }
        $tree[] = $child;
    } 
    return $tree;
}

/* Initialization */
function createTree($flat, $root = 0) {
    $parents = array();
    foreach ($flat as $a) {
        $parents[$a['parent']][] = $a;
    }
    return $this->createBranch($parents, $parents[$root]);
}

Use:

$tree = createTree($flat);
回复 原文
黑白记忆 2024-10-09 13:47:48

我创建了一个不寻常的（“基于 while ”而不是递归）但多维排序函数，它遍历数组直到没有任何孤儿。这里的函数：

function treeze( &$a, $parent_key, $children_key )
{
    $orphans = true; $i;
    while( $orphans )
    {
        $orphans = false;
        foreach( $a as $k=>$v )
        {
            // is there $a[$k] sons?
            $sons = false;
            foreach( $a as $x=>$y )
            if( isset($y[$parent_key]) and $y[$parent_key]!=false and $y[$parent_key]==$k )  
            { 
                $sons=true; 
                $orphans=true; 
                break;
            }

            // $a[$k] is a son, without children, so i can move it
            if( !$sons and isset($v[$parent_key]) and $v[$parent_key]!=false )
            {
                $a[$v[$parent_key]][$children_key][$k] = $v;
                unset( $a[$k] );
            }
        }
    }
}

建议：数组中每个元素的键必须是元素本身的 id。示例：

$ARRAY = array(
    1 => array( 'label' => "A" ),
    2 => array( 'label' => "B" ),
    3 => array( 'label' => "C" ),
    4 => array( 'label' => "D" ),
    5 => array( 'label' => "one", 'father' => '1' ),
    6 => array( 'label' => "two", 'father' => '1' ),
    7 => array( 'label' => "three", 'father' => '1' ),
    8 => array( 'label' => "node 1", 'father' => '2' ),
    9 => array( 'label' => "node 2", 'father' => '2' ),
    10 => array( 'label' => "node 3", 'father' => '2' ),
    11 => array( 'label' => "I", 'father' => '9' ),
    12 => array( 'label' => "II", 'father' => '9' ),
    13 => array( 'label' => "III", 'father' => '9' ),
    14 => array( 'label' => "IV", 'father' => '9' ),
    15 => array( 'label' => "V", 'father' => '9' ),
);

用法：该函数需要$a（数组）、$parent_key（保存父亲id的列名）、$children_key（保存孩子id的列名）将会移动）。它什么也不返回（数组通过引用更改）。例子：

treeze( $ARRAY, 'father', 'children' );
echo "<pre>"; print_r( $ARRAY );

I created an unusual ('while-based' instead of recursive) but multidimensional sorting function that walk the array until there aren't any orphans. Here the function:

function treeze( &$a, $parent_key, $children_key )
{
    $orphans = true; $i;
    while( $orphans )
    {
        $orphans = false;
        foreach( $a as $k=>$v )
        {
            // is there $a[$k] sons?
            $sons = false;
            foreach( $a as $x=>$y )
            if( isset($y[$parent_key]) and $y[$parent_key]!=false and $y[$parent_key]==$k )  
            { 
                $sons=true; 
                $orphans=true; 
                break;
            }

            // $a[$k] is a son, without children, so i can move it
            if( !$sons and isset($v[$parent_key]) and $v[$parent_key]!=false )
            {
                $a[$v[$parent_key]][$children_key][$k] = $v;
                unset( $a[$k] );
            }
        }
    }
}

Recommendation: the key of each element of the array has to be the id fo the element itself. Example:

$ARRAY = array(
    1 => array( 'label' => "A" ),
    2 => array( 'label' => "B" ),
    3 => array( 'label' => "C" ),
    4 => array( 'label' => "D" ),
    5 => array( 'label' => "one", 'father' => '1' ),
    6 => array( 'label' => "two", 'father' => '1' ),
    7 => array( 'label' => "three", 'father' => '1' ),
    8 => array( 'label' => "node 1", 'father' => '2' ),
    9 => array( 'label' => "node 2", 'father' => '2' ),
    10 => array( 'label' => "node 3", 'father' => '2' ),
    11 => array( 'label' => "I", 'father' => '9' ),
    12 => array( 'label' => "II", 'father' => '9' ),
    13 => array( 'label' => "III", 'father' => '9' ),
    14 => array( 'label' => "IV", 'father' => '9' ),
    15 => array( 'label' => "V", 'father' => '9' ),
);

Usage: the function need $a (the array), $parent_key (the name of the column where the id of the father is saved), $children_key (the name of the column where the children will be move). It returns nothing (the array is changed by reference). Example:

treeze( $ARRAY, 'father', 'children' );
echo "<pre>"; print_r( $ARRAY );
回复 原文
爱情眠于流年 2024-10-09 13:47:48
//if order by parentid, id
$arr = array(
    array('id'=>100, 'parentid'=>0, 'name'=>'a'),
    array('id'=>101, 'parentid'=>100, 'name'=>'a'),
    array('id'=>102, 'parentid'=>101, 'name'=>'a'),
    array('id'=>103, 'parentid'=>101, 'name'=>'a'),
);

$arr_tree = array();
$arr_tmp = array();

foreach ($arr as $item) {
    $parentid = $item['parentid'];
    $id = $item['id'];

    if ($parentid  == 0)
    {
        $arr_tree[$id] = $item;
        $arr_tmp[$id] = &$arr_tree[$id];
    }
    else 
    {
        if (!empty($arr_tmp[$parentid])) 
        {
            $arr_tmp[$parentid]['children'][$id] = $item;
            $arr_tmp[$id] = &$arr_tmp[$parentid]['children'][$id];
        }
    }
}

unset($arr_tmp);
echo '<pre>'; print_r($arr_tree); echo "</pre>";

//if order by parentid, id
$arr = array(
    array('id'=>100, 'parentid'=>0, 'name'=>'a'),
    array('id'=>101, 'parentid'=>100, 'name'=>'a'),
    array('id'=>102, 'parentid'=>101, 'name'=>'a'),
    array('id'=>103, 'parentid'=>101, 'name'=>'a'),
);

$arr_tree = array();
$arr_tmp = array();

foreach ($arr as $item) {
    $parentid = $item['parentid'];
    $id = $item['id'];

    if ($parentid  == 0)
    {
        $arr_tree[$id] = $item;
        $arr_tmp[$id] = &$arr_tree[$id];
    }
    else 
    {
        if (!empty($arr_tmp[$parentid])) 
        {
            $arr_tmp[$parentid]['children'][$id] = $item;
            $arr_tmp[$id] = &$arr_tmp[$parentid]['children'][$id];
        }
    }
}

unset($arr_tmp);
echo '<pre>'; print_r($arr_tree); echo "</pre>";
回复 原文
蛮可爱 2024-10-09 13:47:48

实现此目的的一种方法是使用递归函数，该函数首先查找列表的所有底部值，并将它们添加到新数组中。然后，对于每个新 id，您对该 id 使用相同的函数，获取返回的数组并将其填充到该项目的新子数组中。最后，返回新数组。

我不会为你做所有的工作，但函数的参数看起来像这样：

function recursiveChildren($items_array, $parent_id = 0)

本质上，它会找到所有父级为 0 的参数，然后对于每个参数它会找到所有以该 id 作为父级的 id，并且对于每个 id ......依此类推。

最终结果应该是您正在寻找的。

One way to do this is with a recursive function that first finds all the bottom values of the list, adding them to a new array. Then for each new id, you use the same function on that id, taking the returned array and stuffing it in that item's new children array. Finally, you return your new array.

I won't do all the work for you, but the function's parameters will look something like:

function recursiveChildren($items_array, $parent_id = 0)

Essentially, it'll find all the ones with parent of 0, then for each of those it'll find all the ones with that id as the parent, and for each of those.. so on.

The end result should be what you are looking for.

回复 原文
手心的温暖 2024-10-09 13:47:48

这三遍方法有什么原因不起作用吗？我没有做任何测试来比较某些递归解决方案的速度，但它似乎更直接。如果您的初始数组已经与作为键的 ID 关联，那么您可以跳过第一个 foreach()。

function array_tree(&$array) {
    $tree = array();

    // Create an associative array with each key being the ID of the item
    foreach($array as $k => &$v) {
      $tree[$v['id']] = &$v;
    }

    // Loop over the array and add each child to their parent
    foreach($tree as $k => &$v) {
        if(!$v['parent']) {
          continue;
        }
        $tree[$v['parent']]['children'][] = &$v;
    }

    // Loop over the array again and remove any items that don't have a parent of 0;
    foreach($tree as $k => &$v) {
      if(!$v['parent']) {
        continue;
      }
      unset($tree[$k]);
    }

    return $tree;
}

Is there any reason this three pass method wouldn't work? I didn't do any tests to compare speed to some of the recursive solutions, but it seemed more straight forward. If your initial array is already associative with the IDs being the key, then you can skip the first foreach().

function array_tree(&$array) {
    $tree = array();

    // Create an associative array with each key being the ID of the item
    foreach($array as $k => &$v) {
      $tree[$v['id']] = &$v;
    }

    // Loop over the array and add each child to their parent
    foreach($tree as $k => &$v) {
        if(!$v['parent']) {
          continue;
        }
        $tree[$v['parent']]['children'][] = &$v;
    }

    // Loop over the array again and remove any items that don't have a parent of 0;
    foreach($tree as $k => &$v) {
      if(!$v['parent']) {
        continue;
      }
      unset($tree[$k]);
    }

    return $tree;
}
回复 原文
不美如何 2024-10-09 13:47:48

一个更简单的版本：

function build_tree(&$items, $parentId = null) {
    $treeItems = [];
    foreach ($items as $idx => $item) {
        if((empty($parentId) && empty($item['parent_id'])) || (!empty($item['parent_id']) && !empty($parentId) && $item['parent_id'] == $parentId)) {
            $items[$idx]['children'] = build_tree($items, $items[$idx]['id']);
            $treeItems []= $items[$idx];
        }
    }

    return $treeItems;
}
build_tree($array);

A simpler version:

function build_tree(&$items, $parentId = null) {
    $treeItems = [];
    foreach ($items as $idx => $item) {
        if((empty($parentId) && empty($item['parent_id'])) || (!empty($item['parent_id']) && !empty($parentId) && $item['parent_id'] == $parentId)) {
            $items[$idx]['children'] = build_tree($items, $items[$idx]['id']);
            $treeItems []= $items[$idx];
        }
    }

    return $treeItems;
}
build_tree($array);
回复 原文
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