Magento 2 Cache Refresh Script - https://keithgreer.dev/magento-2-cache-refresh-script

cache.php

<?php

use Magento\Framework\App\Bootstrap;
include('app/bootstrap.php'); // Update as required, this line will work if placed in the Magento Root Directory
$bootstrap = Bootstrap::create(BP, $_SERVER);
$objectManager = $bootstrap->getObjectManager();

?><div style='top:45%; position:absolute; width:75%; text-align:center; color:#666; font-weight:bold; font-size:1.8em; '><?php

try{
    $_cacheTypeList = $objectManager->create('Magento\Framework\App\Cache\TypeListInterface');
    $_cacheFrontendPool = $objectManager->create('Magento\Framework\App\Cache\Frontend\Pool');
    $types = array('config','layout','block_html','collections','reflection','db_ddl','eav','config_integration','config_integration_api','full_page','translate','config_webservice');
    foreach ($types as $type) {
        $_cacheTypeList->cleanType($type);
    }
    foreach ($_cacheFrontendPool as $cacheFrontend) {
        $cacheFrontend->getBackend()->clean();
    }
    ?><span style='color:green'>&#9679; Success. </span> The cache has been cleared. <?php
}catch(Exception $e){
    ?><span style='color:red'>&#9679; Error. </span><?php
    echo $msg = 'Error : '.$e->getMessage();die();
}