PHP文件缓存类，_PHP教程

 1 php  2 /**  3  * @desc 文件缓存  4 */  5 class Cache{  6 const C_FILE = '/Runtime/';  7 private $dir = '';  8 const EXT = '.tpl';  9 private $filename = ''; 10 public function __construct($dir = ''){ 11 $this->dir = $dir; 12 13  } 14 /** 15  * @desc 设置文件缓存 16  * @param string $key 文件名 17  * @param unkonw $data 缓存数据 18  * @param int $expire 过期时间 19 */ 20 public function set($key,$data,$expire = 0){ 21 $this->filename = dirname(__FILE__).self::C_FILE.$this->dir.$key.self::EXT; 22 if(file_exists($this->filename)){ 23 $res = $this->get($key); 24 if(md5($res) == md5(json_encode($data) ) ){ 25 return true; 26  } 27  } 28 if(!is_dir(dirname($this->filename))){ 29 mkdir(dirname($this->filename),0777); 30  } 31 32 $source = fopen($this->filename,'w+'); 33 fwrite($source,json_encode($data)); 34 fclose($source); 35  } 36 37 /** 38  * @desc 获取文件 39  * @param string $key 文件名 40 */ 41 public function get($key){ 42 //$filename = dirname(__FILE__).self::C_FILE.$this->dir.$key.self::EXT; 43 if(!file_exists($this->filename)){ 44 return '缓存文件已经不存在'; 45 }else{ 46 $res = file_get_contents($this->filename); 47  } 48 return $res; 49  } 50 /** 51  * @desc 删除文件 52  * @param string $key 文件名 53 */ 54 public function del($key){ 55 unlink($this->filename); 56  } 57 58  } 59 60 $data = array('name'=>'song','age'=>20,'sex'=>'man','favority'=>array('apple','banana')); 61 $cache = new Cache(); 62 $cache->set('cache',$data); 63 //$cache->get('cache'); 64  //$cache->del('cache');