<?php class CacheLayer{ protected $root = ""; protected $cache = ""; protected $key = ""; protected $life = 0; public function __construct($key, $root = "/cachelayer"){ $this->root = $_SERVER["DOCUMENT_ROOT"].$root; $this->key = $key; } public function expired($life_span){ $this->life = $life_span; $file = $this->root."/".$this->key.".cachelayer"; if(is_file($file)){ $mtime = filemtime($file); return (time() >= ($mtime + $this->life)); }else{ return true; } } public function put($content){ $file = $this->root."/".$this->key.".cachelayer"; if(!is_dir(dirname($this->root))){ return false; } $this->delete(); $content = json_encode($content); return (bool)file_put_contents($file, $content); } public function get(){ $file = $this->root."/".$this->key.".cachelayer"; if(is_file($file)){ return json_decode(file_get_contents($file), true); } return array(); } public function delete(){ $file = $this->root."/".$this->key.".cachelayer"; if(is_file($file)){ unlink($file); return true; } return false; } } ?>
这是一份很好用的PHP缓存类库,需要的朋友可以下载使用,可以通过文件缓存,大大缓解数据库的压力
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