php中使用文件缓存的例子

下面是编程之家 jb51.cc 通过网络收集整理的代码片段。

编程之家小编现在分享给大家，也给大家做个参考。

<?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;
    }
}

<?PHP
// Load the cachelayer and the database connection (db connection is optional)
require_once "CacheLayer.PHP";
require_once "db_connection.PHP";

// Create a instance of the cachelayer
$cl_nav = new CacheLayer("navigation");
// Check to see if the cache is expired (60 * 10 = 10 minutes)
if($cl_nav->expired(60 * 10)){
    echo "Cache doesn't exist or is expired. Rebuilding...<br />";
    // if the cache is expired rebuild it
    $result    = MysqL_query("select id,title from navigation");
    $new_cache = array();
    while($row = MysqL_fetch_assoc($result)){
        $new_cache[] = $row;
    }
    // Save the array into the cache
    $cl_nav->put($new_cache);
}
echo "Loading from cache...<br />";
// Get the cache
$cache = $cl_nav->get();

// display the cache
foreach($cache as $row){
    $id    = $row["id"];
    $title = $row["title"];
    echo "<a href='/$id/$title'>$title</a><br />";
}

以上是编程之家(jb51.cc)为你收集整理的全部代码内容，希望文章能够帮你解决所遇到的程序开发问题。

如果觉得编程之家网站内容还不错，欢迎将编程之家网站推荐给程序员好友。