PHPモール関数チュートリアル：商品分類とフィルタリング関数の実装

CREATE TABLE `categories` (
  `id` int(11) UNSIGNED AUTO_INCREMENT PRIMARY KEY,
  `name` varchar(255) NOT NULL,
  `parent_id` int(11) DEFAULT NULL,
  `created_at` timestamp NULL DEFAULT NULL,
  `updated_at` timestamp NULL DEFAULT NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8;

<?php

namespace AppModels;

use IlluminateDatabaseEloquentModel;

class Category extends Model
{
    protected $fillable = ['name', 'parent_id'];

    public function parent()
    {
        return $this->belongsTo(Category::class, 'parent_id');
    }

    public function children()
    {
        return $this->hasMany(Category::class, 'parent_id');
    }
}

<?php

use AppModelsCategory;

function displayCategories($categories, $parent_id = 0)
{
    echo '<ul class="category-list">';

    foreach ($categories as $category) {
        if ($category->parent_id == $parent_id) {
            echo '<li>';
            echo $category->name;

            $children = $category->children;

            if (count($children) > 0) {
                displayCategories($children, $category->id);
            }

            echo '</li>';
        }
    }

    echo '</ul>';
}

$categories = Category::all();
displayCategories($categories);

<?php

use AppModelsProduct;

function getFilteredProducts($filters)
{
    $query = Product::query();

    if (isset($filters['price'])) {
        $query->whereBetween('price', [$filters['price']['min'], $filters['price']['max']]);
    }

    if (isset($filters['color'])) {
        $query->whereIn('color', $filters['color']);
    }

    // 添加其他筛选条件

    $products = $query->get();

    return $products;
}

// 获取用户提交的筛选条件
$filters = $_POST['filters'];

// 调用筛选函数获取符合条件的商品
$products = getFilteredProducts($filters);