Zend Framework 3 problem with redis caching - php

Question

I am having a problem getting Redis caching working in my ZF3 application.
I have been trying to piece together how to do this from various websites, including SO and am really not sure if I am going the right way about this.
What I am doing so far is this:
In my global.php config file I have added :
...
'redis_cache' => [
'adapter' => [
'name' => 'redis',
'options' => [
'server' => [
'host' => '127.0.0.1',
'port' => 6379,
]
]
],
]
...
In my controller I have
use Zend\Cache\StorageFactory;
and then inside a method I am trying to test the cache using
$redis = StorageFactory::factory ($this->config['redis_cache']);
if ($redis->hasItem ('mykey'))
{
$value = $redis->getItem('mykey');
}
echo 'value = ' . $value;
This is not getting the value. However if I do a print_r() on $redis I can see the Redis object has been created.

Answer 1

In case it is of help to anyone else, this is the solution I found.
Firstly, I needed to install zend-serializer, I already had zend-cache installed.
php composer require zendframework/zend-serializer
Then in /config/autoload/global.php I added
'caches' => [
'RedisCache' => [
'adapter' => [
'name' => Redis::class,
'options' => [
'server' => [
'host' => '127.0.0.1',
'port' => '6379',
],
],
],
'plugins' => [
[
'name' => 'serializer',
'options' => [
],
],
],
],
],
In /config/application.config.php I added
'service_manager' => [
'factories' => [
\Zend\Cache\Storage\Adapter\Redis::class => InvokableFactory::class
]
]
Finally, In my controller factory I set up the dependency injection like this
public function __invoke(ContainerInterface $container, $requestedName, array $options = null)
{
$cache = $container->get('RedisCache');
return new IndexController($cache);
}
To use the caching in my controller I added the caching to my constructor
public function __construct($cache)
{
$this->cache = $cache;
}
and in a method:
$this->cache->setItem('foo', 'bar');
echo $this->cache->getItem('foo');