class cache{
/*
class name: cache
description: control to cache data,$cache_out_time is a array to save cache date time out.
version: 1.0
author: 老農 cjjer
last modify:2006-2-26
author url: http://www.111cn.net*/
private $cache_dir;
private $expiretime=180;//緩衝的時間是 60 秒
function __construct($cache_dirname){
if(!@is_dir($cache_dirname)){
if(!@mkdir($cache_dirname,0777)){
$this->warn('快取檔案不存在而且不能建立,需要手動建立.');
return false;
}
}
$this->cache_dir = $cache_dirname;
}
function __destruct(){
echo 'cache class bye.';
} function get_url() {
if (!isset($_server['request_uri'])) {
$url = $_server['request_uri'];
}else{
$url = $_server['script_name'];
$url .= (!empty($_server['query_string'])) ? '?' . $_server['query_string'] : '';
} return $url;
} function warn($errorstring){
echo "<b><font color='red'>發生錯誤:<pre>".$errorstring."</pre></font></b>";
} function cache_page($pageurl,$pagedata){
if(!$fso=fopen($pageurl,'w')){
$this->warns('無法開啟快取檔案.');//trigger_error
return false;
}
if(!flock($fso,lock_ex)){//lock_nb,排它型鎖定
$this->warns('無法鎖定快取檔案.');//trigger_error
return false;
}
if(!fwrite($fso,$pagedata)){//寫入位元組流,serialize寫入其他格式
$this->warns('無法寫入快取檔案.');//trigger_error
return false;
}
flock($fso,lock_un);//釋放鎖定
fclose($fso);
return true;
} |
