//測試 $cache = new Cache(); $cache->dir = "../cc/"; //$cache->setCache("zhang", "zhangsan", 100); echo $cache->getCache("zhang"); //$cache->removeCache("zhang");  $cache->setCache("liu", "liuqi", 100); echo $cache->getCache("liu"); class Cache{ public $cacheFile = "cache.json"; //文件 public $dir = "./cach2/"; //目錄 //緩存 public function setCache($name, $val, $expires_time){ $file = $this->hasFile(); //字符串轉數組 $str = file_get_contents($file); $arr = json_decode($str, true);  //值為空，則移除該緩存 if(empty($val)){ unset($arr[$name]); }else{ $arr[$name] = array("value"=>$val, "expires_time"=>$expires_time, "add_time"=>time()); }  //數組轉字符串 $str = json_encode($arr); file_put_contents($file, $str); } public function getCache($name){ $file = $this->hasFile();  //字符串轉數組 $allArr = json_decode($str, true); $arr = $allArr[$name]; if(!$arr || time() > ($arr["expires_time"] + $arr["add_time"])){ $this->removeCache($name); //過期移除 return false; } return $arr["value"]; } public function removeCache($name){ $this->setCache($name, '', 0); }  private function hasFile(){ //如果不存在緩存文件，則創建一個 if(!file_exists($this->dir)){ mkdir($this->dir); } if(!file_exists($this->dir . $this->cacheFile)){ touch($this->dir . $this->cacheFile); } return $this->dir . $this->cacheFile; }}