ci框架安装phpFastCache

1. 首先，我们要编写处在项目根目录下的composer.json文件：
   {
   “require”: {
   “phpfastcache/phpfastcache”: “^6.0”
   }
   }

2. 然后ctrl+R 输入cmd 打开黑窗口 composer update

3. 安装完成之后创建一个Reviews.php文件：

    	// 不管使用什么方法安装phpFastCache都需要引入autoload.php文件，文件所放位置以及路径根据项目情况自行更改。
    	
    	require_once './vendor/autoload.php';
    	defined('BASEPATH') OR exit('No direct script access allowed');
    	use phpFastCache\CacheManager;
   
   
    	class Reviews extends CI_Controller {
    		public function phpfastcache(){
    			$this->load->model("Reviews_model");
    
    			CacheManager::setDefaultConfig(array("path" => '/cache'));
    
    			// Get instance of files cache
    			$objFilesCache = CacheManager::getInstance('files');
    
    			$key = "welcome_message";
    			 
    			// Try to fetch cached item with "welcome_message" key
    			$CachedString = $objFilesCache->getItem($key);
    			 
    			if (is_null($CachedString->get()))
    			{
    			    // The cached entry doesn't exist
    			    $numberOfSeconds = 60;
    			    $CachedString->set("月月写的phpFastCache测试！")->expiresAfter($numberOfSeconds);
    			    $objFilesCache->save($CachedString);
    			 
    			    echo "Not in cache yet, we set it in cache and try to get it from cache!</br>";
    			    echo "The value of welcome_message:" . $CachedString->get();
    			}
    			else
    			{
    			    // The cached entry exists
    			    echo "Already in cache!</br>";
    			    echo "The value of welcome_message:" . $CachedString->get();
    			}
    		}
    	}
   

4. 然后去浏览器输入http://url/Reviews/phpfastcache
   Not in cache yet, we set it in cache and try to get it from cache!
   The value of welcome_message:月月写的phpFastCache测试！