Using Yii Cache

My cache component is configured in the config\main.php file as follows:

'components' => [ 
    'cache' => [ 
        'class' => 'yii\caching\FileCache', 
        'cachePath' => '@runtime/cache2', 
    ], 
],

The so-called file cache is actually storing the data we want to cache in the file.

File cache path:

The default cache path is in the @app\runtime\cache directory. If you want to modify the cache path, you can configure the cachePath like the above configuration.

$cache = Yii:: $app -> cache; 
 $data = $cache ->get('cache_data_key' ); 
 if ( $data === false ) { 
     // Here we can manipulate the database to get data, and then pass $cache ->set method to cache 
    $cacheData = ...... 
     // The first parameter of the set method is the key value corresponding to our data, which is convenient for us to obtain
    //The second parameter is the data we want to cache
    //The third parameter is the cache time, if it is 0, it means permanent cache. Default is 0 
    $cache ->set('cache_data_key', $cacheData , 60*60 );
}
var_dump ( $ data );

Reference from: http://www.manks.top/yii2_cache.html