php实现静态缓存类

 1 class File
 2 {
 3     private $_dir;
 4     const EXT = ‘.txt‘;
 5     
 6     public function __construct()
 7     {
 8         $this->_dir = dirname(__FILE__).‘/files‘;
 9     }
10 
11     public function cacheData($key, $value=‘‘, $path = ‘‘){
12 
13         # 拼接文件名
14         $filename = $this->_dir.$path.‘/‘.$key.self::EXT;
15 
16         # 写入缓存
17         if ($value !== ‘‘) {
18 
19             # 删除缓存
20             if (is_null($value)) {
21                 return unlink($filename);
22             }
23             
24             $dir = dirname($filename);
25 
26             # 判断目录是否存在
27             if (!is_dir($dir)) {
28                 mkdir($dir,0777);
29             }
30 
31             return file_put_contents($filename, json_encode($value));
32 
33         # 读取缓存    
34         }else{
35 
36             if (!is_file($filename)) {
37                 return false;
38             }else{
39 
40                 # 解析json字符串并返回
41                 return json_decode(file_get_contents($filename),true);
42             }
43         }
44     }
45 }

 1 $file = new File;
 2 
 3 $data[‘id‘] = 1;
 4 $data[‘name‘] = ‘yach‘;
 5 $data[‘data‘][] = 1;
 6 $data[‘data‘][] = 3;
 7 $data[‘data‘][‘msg‘] = ‘helloword‘;
 8 
 9 # 添加
10 $file->cacheData(‘test‘,$data);
11 
12 # 读取
13 $file->cacheData(‘test‘);
14 
15 # 删除
16 $file->cacheData(‘test‘,null);