Magento 2 : PHP Static Script for Re-Indexing

magento2_reindex_script.php

<?php
use Magento\Framework\App\Bootstrap;

require __DIR__ . '/app/bootstrap.php';
ini_set('display_errors', 1);
$host = $_SERVER['HTTP_HOST'];
$params = $_SERVER;
$bootstrap = Bootstrap::create(BP, $params);
$objectManager = $bootstrap->getObjectManager();
$state = $objectManager->get('Magento\Framework\App\State');
$state->setAreaCode('frontend');

$indexerFactory = $objectManager->get('Magento\Indexer\Model\IndexerFactory');
$indexerCollectionFactory = $objectManager->get('Magento\Indexer\Model\Indexer\CollectionFactory');

$indexerCollection = $indexerCollectionFactory->create();
$ids = $indexerCollection->getAllIds();
foreach ($ids as $id) {
    echo " create index: ".$id."<br />";
   $idx = $indexerFactory->create()->load($id);
   $idx->reindexAll($id);
}