PHP是不是没有CACHE?
真要做内存缓存,非分布式,是不是只能在APPLICATION这个对象中做?
------解决方案--------------------
网摘php缓存技术:
普遍缓存技术
数据缓存:这里所说的数据缓存是指数据库查询缓存,每次访问页面的时候,都会先检测相应的缓存数据是否存在,如果不存在,就连接数据库,得到数据,并把查询结果序列化后保存到文件中,以后同样的查询结果就直接从缓存表或文件中获得。
用的最广的例子看Discuz的搜索功能,把结果ID缓存到一个表中,下次搜索相同关键字时先搜索缓存表。
举个常用的方法,多表关联的时候,把附表中的内容生成数组保存到主表的一个字段中,需要的时候数组分解一下,这样的好处是只读一个表,坏处就是两个数据同步会多不少步骤,数据库永远是瓶颈,用硬盘换速度,是这个的关键点。
页面缓存:
每次访问页面的时候,都会先检测相应的缓存页面文件是否存在,如果不存在,就连接数据库,得到数据,显示页面并同时生成缓存页面文件,这样下次访问的时候页面文件就发挥作用了。(模板引擎和网上常见的一些缓存类通常有此功能)
时间触发缓存:
检查文件是否存在并且时间戳小于设置的过期时间,如果文件修改的时间戳比当前时间戳减去过期时间戳大,那么就用缓存,否则更新缓存。
内容触发缓存:
当插入数据或更新数据时,强制更新缓存。
静态缓存:
这里所说的静态缓存是指静态化,直接生成HTML或XML等文本文件,有更新的时候重生成一次,适合于不太变化的页面,这就不说了。
以上内容是代码级的解决方案,我直接CP别的框架,也懒得改,内容都差不多,很容易就做到,而且会几种方式一起用,但下面的内容是服务器端的缓存方案,非代码级的,要有多方的合作才能做到
内存缓存:
Memcached是高性能的,分布式的内存对象缓存系统,用于在动态应用中减少数据库负载,提升访问速度。
这里说下Memcached的例子:
代码
- PHP code
<?php $memcache = new Memcache;$memcache->connect('localhost', 11211) or die ("Could not connect");$version = $memcache->getVersion();echo "Server's version: ".$version."\n";$tmp_object = new stdClass;$tmp_object->str_attr = 'test';$tmp_object->int_attr = 123;$memcache->set('key', $tmp_object, false, 10) or die ("Failed to save data at the server");echo "Store data in the cache (data will expire in 10 seconds)\n";$get_result = $memcache->get('key');echo "Data from the cache:\n";var_dump($get_result);?><div class="clear"> </div>

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