用ob_start()控制缓冲，给页面做文件缓存，加速页面
我们可能都有这样的经验，用php写了一个打开好几个数据库，几十次数据查询的首页，速度慢是可想而知啊，但是这个页面不大好做模板生成静态页，太麻烦了。怎么办了？我使用了这个解决方案，控制php的输出缓冲，截获处理后的html，保存成文件，然后的请求就检查这个文件的时间，若在设置的时间内，直接读取，发送。如果已经超时，就重新读取动态页面。<div style="padding-right: 5.4pt; padding-left: 5.4pt; background: #e6e6e6; padding-bottom: 4px; width: 95%; padding-top: 4px;">http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif<?php
http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif//--------------------------------------------------------------------------
http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif//文件名:index.php
http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif//描述:主站首页
http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif//需求:PHP4(http://www.php.net)
http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif
http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif//Copyright(C),www.cnfdc.com.cn,2005,AllRightsReserved.
http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif
http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif//作者:lonestone(wangyong.yichang@gmail.com)
http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif
http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif//--------------------------------------------------------------------------
http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif//缓存文件名和缓存时间
http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif$cachefilename='./cache/index.cache';
http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif$cachetime=3600;
http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif
http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif//强制更新缓存
http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gifif($_GET['c'])
http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif{
http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gifechoCacheFile();
http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gifdie();
http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif}
http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif
http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif//检测缓存是否存在
http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gifif(file_exists($cachefilename))
http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif{
http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif$lastmodifytime=filemtime($cachefilename);
http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gifif($lastmodifytime&&(time()-$lastmodifytime)>$cachetime)
http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif{
http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gifechoCacheFile();
http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif}
http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gifelse
http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif{
http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gifechoReadCache();
http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif}
http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif}
http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gifelse
http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif{
http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gifechoCacheFile();
http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif}
http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif
http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif
http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif//生成HTML并缓存成文件
http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.giffunctionCacheFile()
http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif{
http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gifglobal$cachefilename;
http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif//打开输出缓存
http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gifob_start();
http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif
http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif//这里开始链接数据库，查询，用ADODB+SMARTY技术。
http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif
http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif$tpl->Display("index.html");
http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif//处理完成，截获缓冲内容
http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif
http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif
http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif//得到缓存内容
http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif$content=ob_get_contents();
http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif//清空缓冲区，否则最终还是会输出给浏览器，这样就会有两个首页了
http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gifob_end_clean();
http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif//写入文件，若不可写则返回缓存
http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gifif(is_writable($cachefilename))
http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif{
http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif$handle=fopen($cachefilename,"w");
http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.giffwrite($handle,$content);
http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.giffclose($handle);
http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif}
http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gifelse
http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif{
http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gifreturnReadCache()."outdated";
http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif}
http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif
http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gifreturn$content.'newcache';
http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif
http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif}
http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif
http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif//读取缓存文件
http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.giffunctionReadCache()
http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif{
http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gifglobal$cachefilename;
http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif$handle=fopen($cachefilename,"r");
http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif$content='';
http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gifwhile(!feof($handle))
http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif{
http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif$line=fgets($handle);
http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif$content.=$line;
http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif}
http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.giffclose($handle);
http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gifreturn$content.'cachedat'.date("Y-m-dH:i:s",filemtime($cachefilename));
http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif}
http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif
http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif
http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif
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