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php smarty 缓存使用

一、使用缓存

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要开启smarty的缓存,只需将caching设为true,并指定cache_dir即可.
使用cache_lefetime指定 缓存生存时间,单位为秒
要对相同页面生成多个不同的缓存,在display或fetch中加入第二参数cache_id, 如$smarty->display('index.tpl',$my_cache_id);此特性可用于对不同的$_GET进行不同的缓存

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二、清除缓存


clear_all_cache();//清除所有缓存
clear_cache('index.tpl');// 清除index.tpl的缓存
clear_cache('index.tpl',cache_id);//清除指定id的缓存


三、使用自定义缓存方式


设置cache_handler_func使用自定义的函数处理缓存
如:
$smarty->cache_handler_func = "myCache";
function myCache($action, &$smarty_obj, &$cache_content, $tpl_file=null, $cache_id=null, $compile_id=null){
}
该 函数的一般是根椐$action来判断缓存当前操作:
switch($action){
case "read"://读取缓存内容
case "write"://写入缓存
case "clear"://清空
}
一般使用 md5($tpl_file.$cache_id.$compile_id)作为唯一的cache_id
如果需要,可使用gzcompress和 gzuncompress来压缩和解压

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四、局部关闭缓存


要在某些区域使缓存失效(只对需要的缓存),有几种方法:
inser:
定 义一个inser标签要使用的处理函数,函数名格式为:insert_xx(array $params, object &$smarty)其中的xx是insert的name,也就是说,如果你定义的函数为insert_abc,则模板中使用方法为{insert name='abc'}
参数通过$params传入
也可以做成insert插件,文件名命名为:insert.xx.php,函数命名 为:smarty_insert_aa($params,&$smarty),xx定义同上
register_block:
定 义一个block:smarty_block_name($params,$content, &$smarty){return $content;} //name表示区域名
注册block:$smarty->register_block('name', 'smarty_block_name', false); //第三参数false表示该区域不被缓存
模板写法:{name}内容 {/name}

写成block插件:
1)定义一件插件函数:block.cacheless.php,放在smarty的plugins目录
block.cacheless.php 的内容如下:

function smarty_block_cacheless($param, $content, &$smarty) {
return $content;
}
?>

2) 编写程序及模板
示例程序:testCacheLess.php

include('Smarty.class.php');
$smarty = new Smarty;
$smarty->caching=true;
$smarty->cache_lifetime = 6;
$smarty->display('cache.tpl');
?>


所用的模 板:cache.tpl

已经缓存的:{$smarty.now}

{cacheless}
没有缓 存的:{$smarty.now}
{/cacheless}

现在运行一下,发现是不起作用的,两行内容都被缓存了
3)改写Smarty_Compiler.class.php(注:该文件很重 要,请先备份,以在必要时恢复)
查找$this->_plugins['block'][$tag_command] = array($plugin_func, null, null, null, true); //我的在705行
修改成:
if($tag_command == 'cacheless') $this->_plugins['block'][$tag_command] = array($plugin_func, null, null, null, false);
else $this->_plugins['block'][$tag_command] = array($plugin_func, null, null, null, true);

你也可以直接将原句的最后一个参数改成false,我对smarty的内部机制不太了解,所以加了一个判断,只要block是 cacheless的才不作缓存

4)OK,现在清除template_c里的编译文件,重新运行,起作用了吧?

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