PHP：构建分层数组结构

Question

我在构建分层数组结构时遇到了一些问题 - 我几乎完成了，但是有一些无法解释的东西让我的数组看起来很奇怪，我希望你能帮助我。

树形结构为：

root
|data
|-children
|--data
|--children
|---data
|---children

任何孩子可以有任意数量的孩子，每个孩子可以有任意数量的父母。

我有一个构建树的函数：

private function build_tree($rows,$parent) {
    $i = 0;
    $response -> result = array();
    $result = array();
    $leaf = false;

    foreach($rows as $row) {
        if($row['parent_id'] == $parent) {
            $leaf = is_null($row['treeDef']) ? false : true;
            $workingSet = array_merge($result,array(                
                'id' => (int)$i, 
                'parent_id' => (int)$row['parent_id'], 
                'child_id' => (int)$row['id'], 
                'name' => (string)$row['resourceName'], 
                'updated' => strtotime($row['updated']), 
                'purchasedUnit' => (string)$row['purchasingUnit'], 
                'purchasedCost' => (double)$row['purchasingCosts'], 
                'purchasedDiscount' => (double)$row['discount'], 
                'estimateUnit' => (string)$row['estimatingUnit'], 
                'profitAddOn' => (string)$row['profitAddOn'], 
                'landedCost' => (double)$row['landedCost'], 
                'unitCorrelation' => (double)$row['unitCorrelation'], 
                'leadTime' => (string)$row['leadTime'], 
                'ResourceClassShortname' => (string)$row['ResourceClassShortname'], 
                'supplierName' => (string)$row['nameSupplier'],
                'iconCls' => (string)$row['typeIcon'],
                'leaf' => $leaf
            ));
            $hasChildren = $this->Resource_model->has_children($rows,$row['id']);
            if ($hasChildren->check) {
                if (!$leaf) {
                    for($j=0; $j <= ($hasChildren -> rows); $j++) {
                        $parentArray = $workingSet;
                        $childArray = $this -> Resource_model -> build_tree($rows,$row['id']);
                        $workingSet = array_merge($parentArray,array('children' => $childArray -> result));
                    }
                } 
            }
            $result[$i] = $workingSet;
            $i++;
        }
    }

    $response -> result = $result;
    $response -> rows = $i; 
    return $response;
}

产生这个 JSON：

Big picture

具有 2 个子项（或更多？- 没有测试值）的每个项目都按应有的方式获取第一项，但第二项也包含第一项 - 复制所有结果。

任何帮助表示赞赏。

Answer 1

使用array_push 代替array_merge - 这将添加children 子数组，而不是尝试将其与现有的子数组合并...

在这部分代码中（已编辑）：

        $hasChildren = $this->Resource_model->has_children($rows,$row['id']);
        if ($hasChildren->check) {
            if (!$leaf) {
                for($j=0; $j <= ($hasChildren->rows); $j++) {
                    $parentArray = $workingSet;
                    $childArray = $this->Resource_model->build_tree($rows,$row['id']);
                    $workingSet = array_push($parentArray,array('children' => $childArray->result));
                }
            } 
        }

Answer 2

让它工作，这是最终代码：

private function build_tree($rows,$parent) {
    $i = 0;
    $response -> result = array();
    $result = array();
    $leaf = false;
    $newArray = array();

    foreach($rows as $row) {
        if($row['parent_id'] == $parent) {
            $leaf = is_null($row['treeDef']) ? false : true;
            $newArray = array(              
                'id' => (int)$i, 
                'parent_id' => (int)$row['parent_id'], 
                'child_id' => (int)$row['id'], 
                'name' => (string)$row['resourceName'], 
                'updated' => strtotime($row['updated']), 
                'purchasedUnit' => (string)$row['purchasingUnit'], 
                'purchasedCost' => (double)$row['purchasingCosts'], 
                'purchasedDiscount' => (double)$row['discount'], 
                'estimateUnit' => (string)$row['estimatingUnit'], 
                'profitAddOn' => (string)$row['profitAddOn'], 
                'landedCost' => (double)$row['landedCost'], 
                'unitCorrelation' => (double)$row['unitCorrelation'], 
                'leadTime' => (string)$row['leadTime'], 
                'ResourceClassShortname' => (string)$row['ResourceClassShortname'], 
                'supplierName' => (string)$row['nameSupplier'],
                'iconCls' => (string)$row['typeIcon'],
                'leaf' => $leaf
            );

            $hasChildren = $this -> Resource_model -> has_children($rows,$row['id']);
            if ($hasChildren->check) {
                for($j=0; $j <= ($hasChildren -> rows); $j++) {
                    $childArray = $this -> Resource_model -> build_tree($rows,$row['id']);
                    $newArray = array_merge($newArray, array('children' => $childArray -> result));
                }
            }
            $result[$i] = $newArray;
            $i++;
        }
    }

    $response -> result = $result;
    $response -> rows = $i; 
    return $response;
}