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I don't know how to implement this task. I want to get product name, SKU, and image in magento2. Can you please help me?

I think you can fetch all product data using following code. Just put this code in your php file example.php. Hope it works.

 <?php
use MagentoFrameworkAppBootstrap;

require __DIR__ . '/app/bootstrap.php';
$params = $_SERVER;
$bootstrap = Bootstrap::create(BP, $params);

$obj = $bootstrap->getObjectManager();

$state = $obj->get('MagentoFrameworkAppState');
$state->setAreaCode('frontend');

$objectManager = MagentoFrameworkAppObjectManager::getInstance();

$productCollection = $objectManager->create('MagentoCatalogModelResourceModelProductCollectionFactory');
$storeManager = $objectManager->get('MagentoStoreModelStoreManagerInterface');
$mediaurl= $storeManager->getStore()->getBaseUrl(MagentoFrameworkUrlInterface::URL_TYPE_MEDIA);
$collection = $productCollection->create()
 ->addAttributeToSelect('*')
 ->load();

foreach ($collection as $product)
 echo 'Name = '.$product->getName().'<br>';
 echo 'Sku = '.$product->getSku().'<br><br>';
 $imagepath = $mediaurl.'catalog/product'.$product->getImage();
 $img = '<img src='.$imagepath.' />';
 echo $img;
 

?>

<?php 
use MagentoFrameworkAppBootstrap;
require __DIR__ . '/app/bootstrap.php';

$bootstrap = Bootstrap::create(BP, $_SERVER);
$obj = $bootstrap->getObjectManager();

$state = $obj->get('MagentoFrameworkAppState');
$state->setAreaCode('frontend');

try

 $objectManager = MagentoFrameworkAppObjectManager::getInstance();
 $product_Id = 5;
 $product = $objectManager->get('MagentoCatalogModelProduct')->load($product_Id);

 //product name 
 echo $product->getName();

 //product Sku
 echo $product->getSku();

 //Product Image
 if($product->getImage() != '')
 
 echo $product->getImage();
 

catch(Exception $e)

 echo $e->getMessage();
 exit;

SKU:

<?php $block->escapeHtml($_product->getSku()) ?>

Product Name:

<?php
 $_productNameStripped = $block->stripTags($_product->getName(), null, true);
?>

Image:

<?php 
 $_helper = $this->helper('MagentoCatalogHelperOutput'); 
 $img = $this->helper('MagentoCatalogHelperImage')
 ->init($product, 'product_base_image')
 ->constrainOnly(TRUE)
 ->keepAspectRatio(TRUE)
 ->keepTransparency(TRUE)
 ->keepFrame(FALSE)
 ->resize(320, 240);
?>

Use below line wherever you want your image to be displayed:

<?php echo $img->getUrl(); ?>

Just put below code in your file example.php

<?php
use MagentoFrameworkAppBootstrap;

require __DIR__ . '/app/bootstrap.php';

$params = $_SERVER;

$bootstrap = Bootstrap::create(BP, $params);

$obj = $bootstrap->getObjectManager();
$store = $obj->get('MagentoStoreModelStoreManagerInterface')->getStore();
$state = $obj->get('MagentoFrameworkAppState');
$state->setAreaCode('frontend');

/** get product data by product id ****/
$productId = 1;
$product = $obj->get('MagentoCatalogModelProductRepository')
 ->getById($productId);

echo "Name :".$product->getName();
echo "Sku :". $product->getSku();
echo "Image : ".$store->getBaseUrl(MagentoFrameworkUrlInterface::URL_TYPE_MEDIA) . 'catalog/product' . $product->getImage();
?>

You can manage to work this by using following code:

<?php
 use MagentoFrameworkAppBootstrap;
 require __DIR__ . '/app/bootstrap.php';
 $params = $_SERVER;
 $bootstrap = Bootstrap::create(BP, $params);
 $objectManager = $bootstrap->getObjectManager();
 $state = $objectManager->get('MagentoFrameworkAppState');
 $state->setAreaCode('frontend');
 $store = $objectManager->get('MagentoStoreModelStoreManagerInterface')->getStore();

 $productCollection = $objectManager->create('MagentoCatalogModelResourceModelProductCollectionFactory');
 $collection = $productCollection->create()->addAttributeToSelect('*')->load();

 foreach ($collection as $product)
 $name = $product->getName();
 $sku = $product->getSku();
 $imageUrl = $store->getBaseUrl(MagentoFrameworkUrlInterface::URL_TYPE_MEDIA).'catalog/product'.$product->getImage();
 $image = '<img src="'.$imageUrl.'"/>';
 
?>