Magento2 - Programatically Increase/Decrease product price by certain amount for all products

Question

I need to update(increase/decrease) the price & special price by certain amount or percentage for all products in all stores.

Here is the my code but its not increase/decrease the price. I have also refered few links but not match with the needs.

<?php

error_reporting(1);
ini_set('max_execution_time', 0);
use \Magento\Framework\App\Bootstrap;
require __DIR__ . '/app/bootstrap.php';

$bootstrap = \Magento\Framework\App\Bootstrap::create(BP, $_SERVER);
$objectManager = $bootstrap->getObjectManager();
$objectManager = \Magento\Framework\App\ObjectManager::getInstance();
$state = $objectManager->get('\Magento\Framework\App\State');
$state->setAreaCode('frontend');

$updateprice = "100";

$productFactory = $objectManager->get('\Magento\Catalog\Model\ProductFactory');
$product = $productFactory->create()->load();
$product->setPrice($updateprice);
$product->save();
?>

My version is Magento 2.2.4

Can anyone let me know how to increase/decrease the price for all products?

Answer 1

try my below code

<?php
ob_start();
use Magento\Framework\App\Bootstrap;
include('app/bootstrap.php');
$bootstrap = Bootstrap::create(BP, $_SERVER);
$objectManager = $bootstrap->getObjectManager();
$state = $objectManager->get('Magento\Framework\App\State');
$state->setAreaCode('frontend');
ini_set('memory_limit', '1024M');

$updateprice = "100";
$storeId = '1'; //Store ID
$productCollection = $objectManager->create('Magento\Catalog\Model\ResourceModel\Product\Collection');
$products = $productCollection->addAttributeToSelect('*')
            ->load();
foreach ($products as $_product) {
    $price = $_product->getPrice();   
    $getSpecialPrice = $_product->getSpecialPrice(); 
    $_product->setPrice($price + $updateprice);
    $_product->setSpecialPrice($price + $updateprice);
    $_product->save();
}

Before

After