功能很简单，就是缓存整个页面，可以设定缓存时间，可以缓存特定的url，例如：test.php?id=12，当目标文件更新时，如test.php，缓存文件也会更新，即使仍处于缓存期内。
主要功能： 无限级分类，商品可在各类别间自由转移； 组合商品概念，可以用于组配商品销售（比如服装鞋帽的颜色、尺码大小等），组合销售等销售方式； 商品的自定义属性功能，商品类别扩展属性，满足商品多属性需求（比如某一笔记本电脑，可以有cpu、内存、显示屏、硬盘等等扩展属性）； 按照商品类别查看热卖、特价，允许按每个类别增加当前类别的热卖、特价等商品； 会员分级功能，会员积分功能。可根据会
0
class cache
{
var $cache_dir = ./cache/;//This is the directory where the cache files will be stored;
var $cache_time = 120;//How much time will keep the cache files in seconds.
var $caching = false;
var $file = ;
function cache()
{
//Constructor of the class
$this->file = $this->cache_dir . urlencode( $_SERVER[REQUEST_URI] );
if(file_exists($this->file)) $expired = $this->check_expire();
else $expired = false;
if ( file_exists ( $this->file ) && ( filemtime ( $this->file ) + $this->cache_time ) > time() && !$expired )
{
//Grab the cache:
$handle = fopen( $this->file , "r");
do {
$data = fread($handle, 8192);
if (strlen($data) == 0) {
break;
}
echo $data;
} while (true);
fclose($handle);
exit();
}
else
{
//create cache :
$this->caching = true;
ob_start();
$now = time();
echo "
";
}
}
function close()
{
//You should have this at the end of each page
if ( $this->caching )
{
//You were caching the contents so display them, and write the cache file
$data = ob_get_clean();
echo $data;
$fp = fopen( $this->file , w );
fwrite ( $fp , $data );
fclose ( $fp );
}
}
function check_expire(){
$fp = fopen($this->file,"r");
preg_match("/:([d]+)-/",fread($fp,200),$time);
$modify_time = $time[1];
if($modify_time
}
else{
return false;
}
}
}
用法：
//Example :
$ch = new cache();
echo date("D M j G:i:s T Y");
$ch->close();
PHP怎么学习？PHP怎么入门？PHP在哪学？PHP怎么学才快？不用担心，这里为大家提供了PHP速学教程(入门到精通)，有需要的小伙伴保存下载就能学习啦！
Copyright 2014-2025 https://www.php.cn/ All Rights Reserved | php.cn | 湘ICP备2023035733号
11059
收藏
