Magento 2: Get product attribute’s select option id,label for all products from root folder

First create test.file in root folder place below code

<?php
echo '<pre>';
require __DIR__ . '/app/bootstrap.php';
$bootstrap = \Magento\Framework\App\Bootstrap::create(BP, $_SERVER);
/** @var \Magento\Framework\App\Http $app */
$obj = $bootstrap->getObjectManager();
$state = $obj->get('Magento\Framework\App\State');
$state->setAreaCode('frontend');
/** @var \Magento\Framework\App\Http $app */
$app = $bootstrap->createApplication('TestApp');
$bootstrap->run($app);

After that create  loaded application file with name of Testapp (bold letter) place the below code

<?php
class TestApp extends \Magento\Framework\App\Http implements \Magento\Framework\AppInterface {

    public function launch() {
        echo "<pre>";
//die("here");
        $objectManager = \Magento\Framework\App\ObjectManager::getInstance();
        $orderDatamodel = $objectManager->get('Magento\Catalog\Model\Product')->getCollection();
        $orderDatamodel->addAttributeToSelect('*');
        foreach ($orderDatamodel as $orderDatamodels) {

            $attr = $orderDatamodels->getResource()->getAttribute('manufacturer');
            $optionText = $attr->getSource()->getOptionText($orderDatamodels->getData('manufacturer'));
            echo $orderDatamodels->getData('sku')."===========".$optionText."<br />";
        }
}
    public function catchException(\Magento\Framework\App\Bootstrap $bootstrap, \Exception $exception) {
        return false;
    }
}

?>

Then run in browser http://www.yoururl.com/test.php
 you will get output like below::
1002250 =========== Fila
1003100 =========== Reebok

The above code written for manufacturer attribute option text getting.You can use for other attribute as you like.

Thank you guys :)