<?php
$cacheBackend = 'TYPO3\\CMS\\Core\\Cache\\Backend\\RedisBackend';

$caches = [
    'cache_hash',
    'cache_pages',
    'cache_pagesection',
    'cache_rootline',
    'extbase_object',
    'extbase_reflection'
];

foreach ($caches as $key => $cache) {
    $GLOBALS['TYPO3_CONF_VARS']['SYS']['caching']['cacheConfigurations'][$cache]['backend'] = $cacheBackend;
    if ($cacheBackend === 'TYPO3\\CMS\\Core\\Cache\\Backend\\RedisBackend') {
        $GLOBALS['TYPO3_CONF_VARS']['SYS']['caching']['cacheConfigurations'][$cache]['options']['hostname'] = 'redis';
        $GLOBALS['TYPO3_CONF_VARS']['SYS']['caching']['cacheConfigurations'][$cache]['options']['port'] = 6379;
        $GLOBALS['TYPO3_CONF_VARS']['SYS']['caching']['cacheConfigurations'][$cache]['options']['database'] = $key + 2;
    }
}