Magento2 Sandbox

sandbox.php

<?php

ini_set('display_errors', 1);
ini_set('display_startup_errors', 1);
error_reporting(E_ALL);
//echo "hello world";


try {
    require __DIR__ . '/app/bootstrap.php';
} catch (\Exception $e) {
    echo $e->getMessage();
    exit(1);
}

$bootstrap = \Magento\Framework\App\Bootstrap::create(BP, $_SERVER);

$appState = $bootstrap->getObjectManager()->get('Magento\Framework\App\State');
$appState->setAreaCode('en');

//your code here
/** @var Magento\Catalog\Model\ResourceModel\Product\Collection $collection */
$collection = $bootstrap->getObjectManager()->get('Magento\Catalog\Model\ResourceModel\Product\CollectionFactory')->create();
$collection->addStoreFilter()
    ->addAttributeToSelect('*')
    ->addAttributeToFilter('price',['gt'=>30])
    ->setPageSize(10)
    ->load();

echo '<pre>';
foreach ($collection as $product) {
    echo $product->getName() . ' ' . $product->getPrice() . '<br/>';
}
echo '</pre>';