缓存池

use Symfony\Component\Cache\Adapter\ArrayAdapter;
 
$cache = new ArrayAdapter(
    // in seconds; applied to cache items that don't define their own lifetime
    // 0 means to store the cache items indefinitely (i.e. until the current PHP process finishes)
    // 以秒计；适用于没有定义自身生命周期的缓存元素
    // 0 代表把缓存元素地“未定义”地存储（如，只到当前PHP进程结束为止）
    $defaultLifetime = 0,
    // if ``true``, the values saved in the cache are serialized before storing them
    // 如果是true，存入缓存的值将先被序列化再存入
    $storeSerialized = true
);

use Symfony\Component\Cache\Adapter\FilesystemAdapter;
 
$cache = new FilesystemAdapter(
    // the subdirectory of the main cache directory where cache items are stored
    // 缓存元素所在的缓存主目录中的子目录
    $namespace = '',
    // in seconds; applied to cache items that don't define their own lifetime
    // 0 means to store the cache items indefinitely (i.e. until the files are deleted)
    // 以秒计；适用于没有定义自身生命周期的缓存元素
    // 0 代表把缓存元素地“未定义”地存储（如，只到文件被删除时为止）
    $defaultLifetime = 0,
    // the main cache directory (the application needs read-write permissions on it)
    // if none is specified, a directory is created inside the system temporary directory
    // 缓存主目录（需要读写权限）
    // 如果没有被指定，将在系统的临时目录中新建一个目录
    $directory = null

use Symfony\Component\Cache\Adapter\ApcuAdapter;
 
$cache = new ApcuAdapter(
    // the string prefixed to the keys of the items stored in this cache
    // 缓存中的元素的键的字符串前缀
    $namespace = '',
    // in seconds; applied to cache items that don't define their own lifetime
    // 0 means to store the cache items indefinitely (i.e. until the APC memory is deleted)
    // 以秒计；适用于没有定义自身生命周期的缓存元素
    // 0 代表把缓存元素地“未定义”地存储（如，只到APC内存被删除时为止）
    $defaultLifetime = 0,
    // if present, this string is added to the namespace to simplify the
    // invalidation of the entire cache (e.g. when deploying the application)
    // 如果提供此参数，字符串被添加到命名空中，以简化整个缓存的“无效化”（比如在部署程序时）
    $version = null
);

use Symfony\Component\Cache\Adapter\RedisAdapter;
 
$cache = new RedisAdapter(
    // the object that stores a valid connection to your Redis system
    // 用于“把一个有效连接存储到你的Redis系统”的对象
    \Redis $redisConnection,
    // the string prefixed to the keys of the items stored in this cache
    // 缓存中的元素的键的字符串前缀
    $namespace = '',
    // in seconds; applied to cache items that don't define their own lifetime
    // 0 means to store the cache items indefinitely (i.e. until the Redis memory is deleted)
    // 以秒计；适用于没有定义自身生命周期的缓存元素
    // 0 代表把缓存元素地“未定义”地存储（如，只到Redis内存被删除时为止）
    $defaultLifetime = 0
);

use Symfony\Component\Cache\Adapter\ApcuAdapter;
use Symfony\Component\Cache\Adapter\ChainAdapter;
use Symfony\Component\Cache\Adapter\FilesystemAdapter;
 
$apcCache = new ApcuAdapter();
$fileCache = new FilesystemAdapter();
 
$cache = new ChainAdapter(array($apcCache, $fileCache));

use Symfony\Component\Cache\Adapter\ProxyAdapter;
 
// ... create $nonSymfonyCache somehow
$cache = new ProxyAdapter($nonSymfonyCache);

use Doctrine\Common\Cache\SQLite3Cache;
use Symfony\Component\Cache\Adapter\DoctrineAdapter;
 
$sqliteDatabase = new \SQLite3(__DIR__.'/cache/data.sqlite');
$doctrineCache = new SQLite3Cache($sqliteDatabase, 'tableName');
$symfonyCache = new DoctrineAdapter($doctrineCache);

use Symfony\Component\Cache\Adapter\FilesystemAdapter;
 
$cache = new FilesystemAdapter('app.cache');
$latestNews = $cache->getItem('latest_news');

// ...
$stocks = $cache->getItems(array('AAPL', 'FB', 'GOOGL', 'MSFT'));

// ...
$hasBadges = $cache->hasItem('user_'.$userId.'_badges');

// ...
$userFriends = $cache->get('user_'.$userId.'_friends');
$userFriends->set($user->getFriends());
$isSaved = $cache->save($userFriends);

// ...
$isQueued = $cache->saveDeferred($userFriends);
// ...
$isQueued = $cache->saveDeferred($userPreferences);
// ...
$isQueued = $cache->saveDeferred($userRecentProducts);
// ...
$isSaved = $cache->commit();

// ...
$isDeleted = $cache->deleteItem('user_'.$userId);

// ...
$areDeleted = $cache->deleteItems(array('category1', 'category2'));

// ...
$cacheIsEmpty = $cache->clear();