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How to get the placeholder image URL on my template file of product listing page?

 use MagentoStoreModelStoreManager $storeManager

 $this->storeManager = $storeManager;
 $path =
 catalog/placeholder/thumbnail_placeholder OR
 catalog/placeholder/swatch_image_placeholder OR
 catalog/placeholder/small_image_placeholder OR
 catalog/placeholder/image_placeholder OR

 public function getConfig($config_path)
 
 return $this->storeManager->getStore()->getConfig($config_path);
 

<img src = $mediaUrl.'catalog/product/placeholder'.$this->getConfig($path) />
 $mediaUrl = $this ->storeManager->getStore()->getBaseUrl(MagentoFrameworkUrlInterface::URL_TYPE_MEDIA );

On Magento 2.2:

• Get Helper in Block (phtml)
  $imageHelper = $this->helper(MagentoCatalogHelperImage::class);




• Get Helper Global
  $imageHelper = MagentoFrameworkAppObjectManager::getInstance()->get(MagentoCatalogHelperImage::class);




• Get Placeholder Image Url. User as parameter: 'image', 'smal_image', 'swatch_image' or 'thumbnail'.
  $placeholderImageUrl = $imageHelper->getDefaultPlaceholderUrl('image');

If you check your store settings you will find option of Product Image place holders

Stores > Configuration > Catalog > Catalog > Product Image Placeholders

You can call the get the value in block and call in your template file.

<?php 

protected $_scopeConfig;

public function __construct
(
 ---
 MagentoFrameworkAppConfigScopeConfigInterface $scopeConfig
 ---

)
 ---
 $this->_scopeConfig = $scopeConfig;
 ---


public function getPlaceholderImage()
 return $this->_scopeConfig->getValue('catalog/placeholder/image_placeholder'); // Base Image
 $this->_scopeConfig->getValue('catalog/placeholder/small_image_placeholder'); // Small Image
 $this->_scopeConfig->getValue('catalog/placeholder/swatch_image_placeholder'); // Swatch Image
 $this->_scopeConfig->getValue('catalog/placeholder/thumbnail_placeholder'); // Thumbnail Image

In Your Template File Call

$block->getPlaceholderImage();

To get the placeholder image url on the product listing page template, do this:

$imageUrl = $block->getImage($block->getProduct(), 'category_page_grid')->getImageUrl();

In block, use following method:

public function getPlaceholderImage() 
 return sprintf('<img src="%s"/>', $this->getViewFileUrl('Magento_Catalog::images/product/placeholder/thumbnail.jpg'));

We should take a look at the class MagentoCatalogHelperImage

For examle:

<?php

namespace VendorModuleHelper;

use MagentoCatalogHelperImageFactory as HelperFactory;
use MagentoFrameworkViewAssetRepository;

class Image

 /**
 * @var HelperFactory
 */
 protected $helperFactory;

 /**
 * @var Repository
 */
 protected $assetRepos;

 /**
 * Image constructor.
 * @param HelperFactory $helperFactory
 * @param Repository $repository
 */
 public function __construct(
 HelperFactory $helperFactory,
 Repository $repository
 ) 
 $this->assetRepos = $repository;
 $this->helperFactory = $helperFactory;
 

 /**
 * Get image url
 *
 * @param $product
 * @param $imageId
 * @return mixed
 */
 public function getImageUrl($product, $imageId = null)
 
 /** @var MagentoCatalogHelperImage $helper */
 if ($imageId == null) 
 $imageId = 'cart_page_product_thumbnail';
 
 $helper = $this->helperFactory->create()
 ->init($product, $imageId);
 return $helper->getUrl();
 

 /**
 * Get small place holder image
 *
 * @return string
 */
 public function getPlaceHolderImage()
 
 /** @var MagentoCatalogHelperImage $helper */
 $helper = $this->helperFactory->create();
 return $this->assetRepos->getUrl($helper->getPlaceholder('small_image'));
 

If you're trying to get it in any template file. You'll need Magento's image helper. MagentoCatalogHelperImage::class

You can get an instance like this at the top of any .phtml file

$imageHelper = MagentoFrameworkAppObjectManager::getInstance()->get(MagentoCatalogHelperImage::class);

and get the path to the placeholder image url like this

$imageHelper->getDefaultPlaceholderUrl('small_image')
$imageHelper->getDefaultPlaceholderUrl('image')