Laravel数组处理：解决Blade视图中意外输出的“1”和多余元素问题

// 原始控制器代码片段
use App\Models\Session;
use App\Models\Compare;
use App\Models\Product;

// ...
$session = new Session();
$cam = Compare::where('session_id',$session->get('shop_session'))->get('product_id');
$pd_id = [];
$pdt1 = [];
$pdt = [];
$pd_desc = [];

foreach($cam as $ca)
{
   $pd_id[] = $ca->product_id;
}

foreach($pd_id as $pid)
{
   $pdt_query = Product::where('id',$pid);
   $pdt1['image'] = $pdt_query->pluck('product_thumbnail')[0];
   $pdt1['name'] = $pdt_query->pluck('product_name_en')[0];
   $pdt1['currency'] = $pdt_query->pluck('currency')[0];
   $pdt1['selling_price'] = $pdt_query->pluck('selling_price')[0];
   $pdt1['discount_price'] = $pdt_query->pluck('general_discount_price')[0];
   $pdt1['id'] = $pid;
   $pdt[] = $pdt1;

   $pd_desc['Description'][] = Product::where('id',$pid)->pluck('long_descp_en')[0];
   $pd_desc['Tags'][] = Product::where('id',$pid)->pluck('product_tags_en')[0];
   $pd_desc['Ratings & Reviews'][] = NULL;
   $pd_desc1['size'] = Product::where('id',$pid)->pluck('product_size')[0];
   $pd_desc1['color'] = Product::where('id',$pid)->pluck('product_color')[0];
   $pd_desc['Variants'][] = $pd_desc1;
   $pd_desc['Availability'][] = ((Product::where('id',$pid)->pluck('product_qty')[0])>1) ? 'In Stock' : 'Out of Stock';
   $pd_desc['Remove'][] = $pid;
}

$pty['name'] = NULL;
array_push($pdt,$pty); // 关键行
$pd_desc = json_encode($pd_desc);
return view('body.compare',compact('pdt','pd_desc'));

Array
(
 [0] => Array (...)
 [1] => Array (...)
 [2] => Array
     (
        [name] =>
     )
)
1

$pty['name'] = NULL;
array_push($pdt,$pty);

// 优化后的控制器代码片段
use App\Models\Session;
use App\Models\Compare;
use App\Models\Product;
use Illuminate\Support\Facades\Session as LaravelSession; // 使用Laravel的Session Facade

// ... (在控制器方法中) ...

// 获取会话ID，推荐使用Laravel的session() 辅助函数或Session Facade
$shopSessionId = LaravelSession::get('shop_session');

// 1. 获取所有需要比较的产品ID
$compareItems = Compare::where('session_id', $shopSessionId)->get(['product_id']);
$productIds = $compareItems->pluck('product_id')->toArray();

// 2. 一次性获取所有产品详情，并以ID为键，方便后续查找
// 避免N+1查询问题
$products = Product::whereIn('id', $productIds)->get()->keyBy('id');

$pdt = [];
$pd_desc = [
    'Description' => [],
    'Tags' => [],
    'Ratings & Reviews' => [],
    'Variants' => [],
    'Availability' => [],
    'Remove' => []
];

foreach ($productIds as $pid) {
    $product = $products->get($pid); // 从已加载的集合中获取产品

    if ($product) { // 确保产品存在
        $pdt[] = [
            'image' => $product->product_thumbnail,
            'name' => $product->product_name_en,
            'currency' => $product->currency,
            'selling_price' => $product->selling_price,
            'discount_price' => $product->general_discount_price,
            'id' => $pid,
        ];

        // 填充 pd_desc 数组
        $pd_desc['Description'][] = $product->long_descp_en;
        $pd_desc['Tags'][] = $product->product_tags_en;
        $pd_desc['Ratings & Reviews'][] = null; // 根据业务逻辑填充
        $pd_desc['Variants'][] = [
            'size' => $product->product_size,
            'color' => $product->product_color,
        ];
        $pd_desc['Availability'][] = ($product->product_qty > 1) ? 'In Stock' : 'Out of Stock';
        $pd_desc['Remove'][] = $pid;
    }
}

// 如果需要一个空的占位符元素，应在此处明确添加，而不是在循环外随意添加
// 例如：
// if (some_condition_requires_placeholder) {
//     $pdt[] = ['name' => null];
// }

// 将 pd_desc 转换为 JSON 字符串传递给视图
$pd_desc_json = json_encode($pd_desc);

return view('body.compare', compact('pdt', 'pd_desc_json'));

{{-- body/compare.blade.php --}}

<h2>产品对比列表</h2>

@if (!empty($pdt))
    <div class="product-list">
        @foreach ($pdt as $product)
            <div class="product-item">
                <img src="{{ asset($product['image']) }}" alt="{{ $product['name'] }}">
                <h3>{{ $product['name'] }}</h3>
                <p>价格: {{ $product['currency'] }}{{ $product['selling_price'] }}</p>
                @if ($product['discount_price'] > 0)
                    <p>折扣价: {{ $product['currency'] }}{{ $product['discount_price'] }}</p>
                @endif
                <p>ID: {{ $product['id'] }}</p>
            </div>
        @endforeach
    </div>
@else
    <p>没有可供对比的产品。</p>
@endif

<h3>产品详情描述 (JSON格式)</h3>
<pre>{{ $pd_desc_json }}</pre>

{{-- 确保没有其他可能输出 '1' 的隐式语句 --}}