yii2 프로젝트에서 redis를 사용하는 방법

php composer.phar require --prefer-dist yiisoft/yii2-redis:"~2.0.0"

"yiisoft/yii2-redis": "~2.0.0"

return [
    //....
    'components' => [
        'redis' => [
            'class' => 'yii\redis\Connection',
            'hostname' => 'localhost',
            'port' => 6379,
            'database' => 0,
        ],
    ]
];

$redis = Yii::$app->redis;
$key = 'username';
if ($val = $redis->get($key)) {
    return ['redis' => $val];
} else {
    $redis->set($key, 'Leon');
    $redis->expire($key, 5);
}
return ['redis' => 'no data'];

'components' => [
    'cache' => [
        // 'class' => 'yii\caching\FileCache',
        'class' => 'yii\redis\Cache',
    ],
],

'components' => [
    'cache' => [
        // 'class' => 'yii\caching\FileCache',
        'class' => 'yii\redis\Cache',
        'redis' => [
            'hostname' => 'localhost',
            'port' => 6379,
            'database' => 0,
        ],
    ],
],

$cache = Yii::$app->cache;
$key = 'username';
if ($cache->exists($key)) {
    return ['cache' => $cache->get($key)];
} else {
    $cache->set($key, 'Leon', 5);
}
return ['cache' => 'no cache'];

'components' => [
    'session' => [
        'name' => 'advanced-frontend',
        'class' => 'yii\redis\Session'
    ],
],

'components' => [
    'session' => [
        'name' => 'advanced-frontend',
        'class' => 'yii\redis\Session',
        'redis' => [
            'hostname' => 'localhost',
            'port' => 6379,
            'database' => 0,
        ],
    ],
],

$session = Yii::$app->session;
$key = 'username';
if ($session->has($key)) {
    return ['session' => $session->get($key)];
} else {
    $session->set($key, 'Leon');
}
return ['session' => 'no session'];