PHP - 从 foreach 中删除重复项

Question

在 Magento 中，我有一个包含产品的数组，我想从这些产品中获得它们所在的类别。这就是我所拥有的，但我正在使用 foreach 来浏览产品，因此需要删除重复项.

我已经有了 foreach 的类别名称，但是现在需要删除一些重复项。

<?php foreach ($_productCollection as $_product): ?>

    <div class="bk-all-products">

        <?php

            $bk_product_id = $_product->getCategoryIds(); 

            $bk_category_id = $bk_product_id[1];

            $categoryId = $bk_category_id;

            $_objectManager = \Magento\Framework\App\ObjectManager::getInstance();

            $category = $_objectManager->create('Magento\Catalog\Model\Category')

            ->load($categoryId);

            $bk_category_id_name = $category->getName();

            echo $bk_category_id_name;

            echo "<br><br>";

        ?>

    </div>

<?php endforeach; ?>

附加信息

当我还在 foreach 中打印数组时，这就是返回值：

数组 ( [0] => 354 [1] => 362 [2] => 360 [3] => 414) Cafeïnevrije koffie

数组 ( [0] => 354 [1] => 362 [2] => 364 [3] => 414) Cafeïnevrije koffie

数组 ( [0] => 354 [1] => 367 ) Koffiepakketten

数组 ( [0] => 354 [1] => 364 )

数组 ( [0] => 354 [1] => 360 ) 浓缩咖啡

数组（[0] => 354 [1] => 360 [2] => 414）Espressokoffie

数组（[0] => 354 [1] => 364 [2] => 414）

数组（[0] => 354 [1] => 360 [2] => 414）Espressokoffie

数组 ( [0] => 354 [1] => 367 ) Koffiepakketten

数组 ( [0] => 354 [1] => 367 ) Koffiepakketten

数组 ( [0] => 367 [1] => 354 )

数组 ( [0] => 367 [1] => 354 )

Answer 1

最简单的方法是将已经显示的类别存储在 an 中，Array并使用in_array检查您要显示的类别是否已经在其中编辑：存储 id 可能比存储名称更好，因为如果已经获取，您可以避免获取名称：<?php$diplayed_categories = []; //initializing arrayforeach ($_productCollection as $_product):?>&nbsp; &nbsp; <div class="bk-all-products">&nbsp; &nbsp; &nbsp; &nbsp; <?php&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; $bk_product_id = $_product->getCategoryIds();&nbsp;&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; $bk_category_id = $bk_product_id[1];&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; if(!in_array($bk_category_id, $diplayed_categories)){ //testing if not in array&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; $diplayed_categories[] = $bk_category_id; //filling the array&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; //moved inside the if, no need to fetch it again if it exists&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; //$categoryId = $bk_category_id; //useless var&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; $_objectManager = \Magento\Framework\App\ObjectManager::getInstance();&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; $category = $_objectManager->create('Magento\Catalog\Model\Category')&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; ->load($bk_category_id); //replaced by $bk_category_id&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; $bk_category_id_name = $category->getName();&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; echo $bk_category_id_name;&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; echo "<br><br>";&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; }&nbsp; &nbsp; &nbsp; &nbsp; ?>&nbsp; &nbsp; </div><?php endforeach; ?>