如何获取codeigniter中父类的所有子类和孙子类？

问题描述

我想获得父类别的所有子类别和孙子类别直到任何级别。我的表结构是这样的。

I want to get all the child and grandchild categories of a parent category upto any level. My table structure goes like this.

任何人建议我如何获得所有的孩子类别（即三星和S3的电话类别）。

Can anyone suggest me how to get all the child categories (i.e. Samsung and S3 of phone category).

推荐答案

您需要递归。创建这样的函数（假设你使用活动记录）：

You need recursivity. Create a function like this (assuming you use active records):

function getCategoriesByParentId($category_id) {
    $category_data = array();

    $category_query = $this->db->query("SELECT * FROM categories WHERE parent_category = '" . (int)$category_id . "'");

    foreach ($category_query->result() as $category) {
        $category_data[] = array(
            'category_id' => $category->category_id,
            'category_name' => $category->category_name,
            'category_alias' => $category->category_alias,
            'parent_category' => $category->parent_category
        );

        $children = getCategoriesByParentId($category->category_id);

        if ($children) {
            $category_data = array_merge($children, $category_data);
        }
    }

    return $category_data;
}

并像这样调用：

$all_categories = getCategoriesByParentId(0);

输出将如下所示：

Array
(
    [0] => Array
        (
            [category_id] => 14
            [category_name] => s3
            [category_alias] => s3
            [parent_category] => 13
        )

    [1] => Array
        (
            [category_id] => 13
            [category_name] => Samsung
            [category_alias] => samsung
            [parent_category] => 12
        )

    [2] => Array
        (
            [category_id] => 12
            [category_name] => Phone
            [category_alias] => phone
            [parent_category] => 0
        )

)

更多信息，这取自 OpenCart 1.5.4 ，类 ModelCatalogCategory code> catalogue \model\catalog\category.php 。

For more info, this was taken from OpenCart 1.5.4, class ModelCatalogCategory under catalog\model\catalog\category.php.

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