php 无限极

无限极分类-引用

$catList = [
    '1' => ['id' => 1, 'name' => '颜色', 'parent_id' => 0],
    '2' => ['id' => 2, 'name' => '规格', 'parent_id' => 0],
    '3' => ['id' => 3, 'name' => '白色', 'parent_id' => 1],
    '4' => ['id' => 4, 'name' => '黑色', 'parent_id' => 1],
    '5' => ['id' => 5, 'name' => '大', 'parent_id' => 2],
    '6' => ['id' => 6, 'name' => '小', 'parent_id' => 2],
    '7' => ['id' => 7, 'name' => '黄色', 'parent_id' => 1],
];

$treeData = [];// 保存结果
foreach ($catList as $item) {
    if (isset($catList[$item['parent_id']]) && ! empty($catList[$item['parent_id']])) {// 肯定是子分类
        $catList[$item['parent_id']]['children'][] = &$catList[$item['id']];
    } else {// 肯定是一级分类
        $treeData[] = &$catList[$item['id']];
    }
}

dump($treeData);