Redis custom cache for simple saml cache clear all

redis_cache_clear_phpsimplesaml.php

<?php
$config = \SimpleSAML_Configuration::getInstance();
$red = new \SimpleSAML\Store\Redis();

$conf = array(
  'host' => $config->getString('store.redis.host', 'localhost'),
  'port' => $config->getInteger('store.redis.port', 6379),
  'prefix' => $config->getString('store.redis.prefix', 'SimpleSAMLphp'),
  'scheme' => 'tcp',
);
if (!empty($config->getString('store.redis.password',''))) {
  $conf['password'] = $config->getString('store.redis.password','');
}
/***
 * @var \Redis_Client
 */
$redis = $red->get_client($conf);
$redis->_prefix(
  $config->getString('store.redis.prefix', 'SimpleSAMLphp'));
if (!empty($config->getString('store.redis.password',''))) {
  $redis->auth($config->getString('store.redis.password',''));
}
$redis->flushAll();