取自织梦缓存方法，可根据自己的自行修改
首先我们需要一个写入文件的方法
if ( ! function_exists('PutFile'))
{
function PutFile($file, $content, $flag = 0)
{
$pathinfo = pathinfo ( $file );
if (! empty ( $pathinfo ['dirname'] ))
{
if (file_exists ( $pathinfo ['dirname'] ) === FALSE)
{
if (@mkdir ( $pathinfo ['dirname'], 0777, TRUE ) === FALSE)
{
return FALSE;
}
}
}
if ($flag === FILE_APPEND)
{
return @file_put_contents ( $file, $content, FILE_APPEND );
}
else
{
return @file_put_contents ( $file, $content, LOCK_EX );
}
}
}然后我们再写缓存组件
<?php if(!defined('XHINC')) exit("Request Error!");
/**
* 缓存小助手,支持文件和memcache
*
* @version $Id: cache.helper.php 1 10:46 2011-3-2 tianya $
* @package DedeCMS.Helpers
* @copyright Copyright (c) 2007 - 2010, DesDev, Inc.
* @license http://help.dedecms.com/usersguide/license.html
* @link http://www.dedecms.com
*/
/**
* 读缓存
*
* @access public
* @param string $prefix 前缀
* @param string $key 键
* @param string $is_memcache 是否为memcache缓存
* @return string
*/
if ( ! function_exists('GetCache'))
{
function GetCache($prefix, $key, $is_memcache = TRUE)
{
global $cache_helper_config;
$key = md5 ( $key );
/* 如果启用MC缓存 */
if ($is_memcache === TRUE && ! empty ( $cache_helper_config['memcache'] ) && $cache_helper_config['memcache'] ['is_mc_enable'] === 'Y')
{
$mc_path = empty ( $cache_helper_config['memcache'] ['mc'] [substr ( $key, 0, 1 )] ) ? $cache_helper_config['memcache'] ['mc'] ['default'] : $cache_helper_config['memcache'] ['mc'] [substr ( $key, 0, 1 )];
$mc_path = parse_url ( $mc_path );
$key = ltrim ( $mc_path ['path'], '/' ) . '_' . $prefix . '_' . $key;
if (empty ( $GLOBALS ['mc_' . $mc_path ['host']] ))
{
$GLOBALS ['mc_' . $mc_path ['host']] = new Memcache ( );
$GLOBALS ['mc_' . $mc_path ['host']]->connect ( $mc_path ['host'], $mc_path ['port'] );
}
return $GLOBALS ['mc_' . $mc_path ['host']]->get ( $key );
}
$key = substr ( $key, 0, 2 ) . '/' . substr ( $key, 2, 2 ) . '/' . substr ( $key, 4, 2 ) . '/' . $key;
$result = @file_get_contents ( DEDEDATA . "/cache/$prefix/$key.php" );
if ($result === false)
{
return false;
}
$result = str_replace("<?php exit('dedecms');?>\n\r", "", $result);
$result = @unserialize ( $result );
if($result ['timeout'] != 0 && $result ['timeout'] < time ())
{
return false;
}
return $result ['data'];
}
}
/**
* 写缓存
*
* @access public
* @param string $prefix 前缀
* @param string $key 键
* @param string $value 值
* @param string $timeout 缓存时间
* @return int
*/
if ( ! function_exists('SetCache'))
{
function SetCache($prefix, $key, $value, $timeout = 3600, $is_memcache = TRUE)
{
global $cache_helper_config;
$key = md5 ($key);
/* 如果启用MC缓存 */
if (! empty ( $cache_helper_config['memcache'] ) && $cache_helper_config['memcache'] ['is_mc_enable'] === 'Y' && $is_memcache === TRUE)
{
$mc_path = empty ( $cache_helper_config['memcache'] ['mc'] [substr ( $key, 0, 1 )] ) ? $cache_helper_config['memcache'] ['mc'] ['default'] : $cache_helper_config['memcache'] ['mc'] [substr ( $key, 0, 1 )];
$mc_path = parse_url ( $mc_path );
$key = ltrim ( $mc_path ['path'], '/' ) . '_' . $prefix . '_' . $key;
if (empty ( $GLOBALS ['mc_' . $mc_path ['host']] ))
{
$GLOBALS ['mc_' . $mc_path ['host']] = new Memcache ( );
$GLOBALS ['mc_' . $mc_path ['host']]->connect ( $mc_path ['host'], $mc_path ['port'] );
//设置数据压缩门槛
//$GLOBALS ['mc_' . $mc_path ['host']]->setCompressThreshold(2048, 0.2);
}
$result = $GLOBALS ['mc_' . $mc_path ['host']]->set ( $key, $value, MEMCACHE_COMPRESSED, $timeout );
return $result;
}
$key = substr ( $key, 0, 2 ) . '/' . substr ( $key, 2, 2 ) . '/' . substr ( $key, 4, 2 ) . '/' . $key;
$tmp ['data'] = $value;
$tmp ['timeout'] = $timeout != 0 ? time () + ( int ) $timeout : 0;
$cache_data = "<?php exit('dedecms');?>\n\r".@serialize ( $tmp );
return @PutFile (DEDEDATA."/cache/$prefix/$key.php",$cache_data);
}
}
/**
* 删除缓存
*
* @access public
* @param string $prefix 前缀
* @param string $key 键
* @param string $is_memcache 是否为memcache缓存
* @return string
*/
if ( ! function_exists('DelCache'))
{
/* 删缓存 */
function DelCache($prefix, $key, $is_memcache = TRUE)
{
global $cache_helper_config;
$key = md5 ( $key );
/* 如果启用MC缓存 */
if (! empty ( $cache_helper_config['memcache'] ) && $cache_helper_config['memcache'] ['is_mc_enable'] === TRUE && $is_memcache === TRUE)
{
$mc_path = empty ( $cache_helper_config['memcache'] ['mc'] [substr ( $key, 0, 1 )] ) ? $cache_helper_config['memcache'] ['mc'] ['default'] : $cache_helper_config['memcache'] ['mc'] [substr ( $key, 0, 1 )];
$mc_path = parse_url ( $mc_path );
$key = ltrim ( $mc_path ['path'], '/' ) . '_' . $prefix . '_' . $key;
if (empty ( $GLOBALS ['mc_' . $mc_path ['host']] ))
{
$GLOBALS ['mc_' . $mc_path ['host']] = new Memcache ( );
$GLOBALS ['mc_' . $mc_path ['host']]->connect ( $mc_path ['host'], $mc_path ['port'] );
}
return $GLOBALS ['mc_' . $mc_path ['host']]->delete ( $key );
}
$key = substr ( $key, 0, 2 ) . '/' . substr ( $key, 2, 2 ) . '/' . substr ( $key, 4, 2 ) . '/' . $key;
return @unlink ( DEDEDATA . "/cache/$prefix/$key.php" );
}
}使用方法
写入方法
我们首先在ajax数据结束的地方，把数据写入缓存
SetCache('ajax', $name, $result, 1800);ajax是文件夹
$name是文件名字
$result 是数据
1800 是缓存的时间
注意的是会把$name分割每2个字符创建一个文件夹，共创建3个，增加安全，$name会被md5编码
读取方法
在页面开始的地方，判断是否有缓存，注意写入的时间，如果时间没过期，则自动读取缓存，如果时间过期了 会返回false
注意name是写入时候的name
$ns=GetCache('ajax',$name);
if($ns){
var_dump($ns);// 根据自己的方法返回数据即可
exit();
}
else{ //实际使用这句else删掉
echo '没读取到缓存';
exit();
}删除方法
有时候我们需要最新数据，则可以删除掉缓存
注意name是写入时候的name
$ns=DelCache('ajax',$name);