我们需要了解在 Magento2 中如何获取产品图片的大小，为了更清楚的展示，强烈建议遵循以下示例：如何展示和获取已上传产品的图片大小（宽和高）。
第一步：上传产品
打开自定义模块（Mageplaza_HelloWorld），在模块的构造函数中的 app/code/Mageplaza/HelloWorld/Block/HelloWorld.php 类中插入 \Magento\Catalog\Model\ProductRepository 类的对象
<?php
namespace Mageplaza\HelloWorld\Block;
class HelloWorld extends \Magento\Framework\View\Element\Template
{
protected $_productRepository;
protected $_productImageHelper;
public function __construct(
\Magento\Backend\Block\Template\Context $context,
\Magento\Catalog\Model\ProductRepository $productRepository,
\Magento\Catalog\Helper\Image $productImageHelper,
array $data = []
)
{
$this->_productRepository = $productRepository;
$this->_productImageHelper= $productImageHelper;
parent::__construct($context, $data);
}
public function getProductById($id)
{
return $this->_productRepository->getById($id);
}
public function getProductBySku($sku)
{
return $this->_productRepository->get($sku);
}
/**
* Retrieve image width
*
* @return int|null
*/
public function getImageOriginalWidth($product, $imageId, $attributes = [])
{
return $this->_productImageHelper->init($product, $imageId, $attributes)->getWidth();
}
/**
* Retrieve image height
*
* @return int|null
*/
public function getImageOriginalHeight($product, $imageId, $attributes = [])
{
return $this->_productImageHelper->init($product, $imageId, $attributes)->getHeight();
}
}
?>
第二步：获取产品图片的大小
可以获取并打印 product_small_image, product_base_image 和 product_thumbnail_image 等的高和宽，执行以下代码：
$id = YOUR_PRODUCT_ID;
$sku = 'YOUR_PRODUCT_SKU';
$_product = $block->getProductById($id);
$_product = $block->getProductBySku($sku);
echo $block->getImageOriginalWidth($_product, 'product_small_image') . '<br />';
echo $block->getImageOriginalHeight($_product, 'product_small_image') . '<br />';
在 LUMA 作为默认前端模板时，需要打开布局文件 YOUR_MAGENTO_ROOT/vendor/magento/theme-frontend-luma/etc/view.xml, 就可以修改不同类型图片的宽和高了。
<media>
<images module="Magento_Catalog">
<image id="bundled_product_customization_page" type="thumbnail">
<width>140</width>
<height>140</height>
</image>
<image id="cart_cross_sell_products" type="thumbnail">
<width>200</width>
<height>248</height>
</image>
<image id="cart_page_product_thumbnail" type="small_image">
<width>165</width>
<height>165</height>
</image>
<image id="category_page_grid" type="small_image">
<width>240</width>
<height>300</height>
</image>
<image id="category_page_grid-1" type="small_image">
<width>240</width>
<height>300</height>
</image>
<image id="category_page_list" type="small_image">
<width>240</width>
<height>300</height>
</image>
<image id="customer_account_my_tags_tag_view" type="small_image">
<width>100</width>
<height>100</height>
</image>
<image id="customer_account_product_review_page" type="image">
<width>285</width>
<height>285</height>
</image>
<image id="customer_shared_wishlist" type="small_image">
<width>113</width>
<height>113</height>
</image>
<image id="gift_messages_checkout_small_image" type="small_image">
<width>75</width>
<height>75</height>
</image>
<image id="gift_messages_checkout_thumbnail" type="thumbnail">
<width>100</width>
<height>100</height>
</image>
<image id="mini_cart_product_thumbnail" type="thumbnail">
<width>75</width>
<height>75</height>
</image>
<image id="new_products_content_widget_grid" type="small_image">
<width>240</width>
<height>300</height>
</image>
<image id="new_products_content_widget_list" type="small_image">
<width>270</width>
<height>340</height>
</image>
<image id="new_products_images_only_widget" type="small_image">
<width>78</width>
<height>78</height>
</image>
<image id="product_base_image" type="image">
<width>265</width>
<height>265</height>
</image>
<image id="product_comparison_list" type="small_image">
<width>140</width>
<height>140</height>
</image>
<image id="product_page_image_large" type="image"/>
<image id="product_page_image_medium" type="image">
<width>700</width>
<height>560</height>
</image>
<image id="product_page_image_small" type="thumbnail">
<width>88</width>
<height>110</height>
</image>
<image id="product_page_main_image" type="image">
<width>700</width>
<height>560</height>
</image>
<image id="product_page_main_image_default" type="image">
<width>700</width>
<height>560</height>
</image>
<image id="product_page_more_views" type="thumbnail">
<width>88</width>
<height>110</height>
</image>
<image id="product_stock_alert_email_product_image" type="small_image">
<width>76</width>
<height>76</height>
</image>
<image id="product_small_image" type="small_image">
<width>135</width>
<height>135</height>
</image>
<image id="product_thumbnail_image" type="thumbnail">
<width>75</width>
<height>75</height>
</image>
<image id="recently_compared_products_grid_content_widget" type="small_image">
<width>240</width>
<height>300</height>
</image>
<image id="recently_compared_products_images_names_widget" type="thumbnail">
<width>75</width>
<height>90</height>
</image>
<image id="recently_compared_products_images_only_widget" type="thumbnail">
<width>76</width>
<height>76</height>
</image>
<image id="recently_compared_products_list_content_widget" type="small_image">
<width>270</width>
<height>340</height>
</image>
<image id="recently_viewed_products_grid_content_widget" type="small_image">
<width>240</width>
<height>300</height>
</image>
<image id="recently_viewed_products_images_names_widget" type="small_image">
<width>75</width>
<height>90</height>
</image>
<image id="recently_viewed_products_images_only_widget" type="small_image">
<width>76</width>
<height>76</height>
</image>
<image id="recently_viewed_products_list_content_widget" type="small_image">
<width>270</width>
<height>340</height>
</image>
<image id="related_products_list" type="small_image">
<width>152</width>
<height>190</height>
</image>
<image id="review_page_product_image" type="small_image">
<width>285</width>
<height>285</height>
</image>
<image id="rss_thumbnail" type="thumbnail">
<width>75</width>
<height>75</height>
</image>
<image id="sendfriend_small_image" type="small_image">
<width>75</width>
<height>75</height>
</image>
<image id="shared_wishlist_email" type="small_image">
<width>135</width>
<height>135</height>
</image>
<image id="side_column_widget_product_thumbnail" type="thumbnail">
<width>75</width>
<height>90</height>
</image>
<image id="upsell_products_list" type="small_image">
<width>152</width>
<height>190</height>
</image>
<image id="wishlist_sidebar_block" type="thumbnail">
<width>75</width>
<height>90</height>
</image>
<image id="wishlist_small_image" type="small_image">
<width>113</width>
<height>113</height>
</image>
<image id="wishlist_thumbnail" type="small_image">
<width>240</width>
<height>300</height>
</image>
</images>
</media>