blocks|key|1135653|text|memcache你的html，然后做类似这样的事情：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1135654|$memcache+=+memcache_connect('localhost',+11211);

$page++=+$memcache->get('homepage');
if($page+==+""){
++++$mtime+=+microtime();
++++$page+=+get_home();
++++$mtime+=+explode("+",$mtime);
++++$mtime+=+$mtime[1]+%2B+$mtime[0];
++++$endtime+=+$mtime;
++++$totaltime+=+($endtime+-+$starttime);
++++memcache_set($memcache,+'homepage',+$page,+0,+30);
++++$page+.=+"\n";
}
else{
++++$mtime+=+microtime();
++++$mtime+=+explode("+",$mtime);
++++$mtime+=+$mtime[1]+%2B+$mtime[0];
++++$endtime+=+$mtime;
++++$totaltime+=+($endtime+-+$starttime);
++++$page+.=+"\n&lt;!--+served+from+memcache+($totaltime)+-->";
}
die($page);|code-block|syntax|javascript|1135655|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

memcache your html out and then do something like this: 

<pre><code>$memcache = memcache_connect('localhost', 11211);

$page = $memcache-&gt;get('homepage');
if($page == ""){
 $mtime = microtime();
 $page = get_home();
 $mtime = explode(" ",$mtime);
 $mtime = $mtime[1] + $mtime[0];
 $endtime = $mtime;
 $totaltime = ($endtime - $starttime);
 memcache_set($memcache, 'homepage', $page, 0, 30);
 $page .= "\n&lt;!-- Duly stored ($totaltime) --&gt;";
}
else{
 $mtime = microtime();
 $mtime = explode(" ",$mtime);
 $mtime = $mtime[1] + $mtime[0];
 $endtime = $mtime;
 $totaltime = ($endtime - $starttime);
 $page .= "\n&amp;lt;!-- served from memcache ($totaltime) --&gt;";
}
die($page);
</code></pre>

blocks|key|1135722|text|我更喜欢使用缓存反向代理，比如Varnish。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1135723|就纯PHP解决方案而言，您可以在脚本末尾编写一些代码来缓存最终输出，在脚本开头编写代码来检查页面是否被缓存。如果在缓存中找到该页，则发送该页并退出，而不是再次运行查询。|1135724|<?php

function+cache_file()+{
++++//+something+to+(hopefully)+uniquely+identify+the+resource
++++$cache_key+=+md5($_SERVER['HTTP_HOST']+.+$_SERVER['REQUEST_URI']+.+$_SERVER['QUERY_STRING']);
++++$cache_dir+=+'/tmp/phpcache';

++++return+$cache_dir+.+'/'+.+$cache_key;
}

//+if+we+have+a+cache+file,+deliver+it
if(+is_file(+$cache_file+=+cache_file()+)+)+{
++++readfile(+$cache_file+);
++++exit;
}

//+cache+via+output+buffering,+with+callback
ob_start(+'cache_output'+);

//
//+expensive+processing+happens+here,+along+with+page+output.
//

function+cache_output(+$content+)+{
++++file_put_contents(+cache_file(),+$content+);
++++return+$content;
}|code-block|syntax|javascript|1135725|显然，这需要对您的设置进行大量定制，包括缓存过期、满足您需求的$cache_key以及错误检测，这样就不会缓存坏页面。|style|CODE|1135726|entityMap|0|LINK|mutability|MUTABLE|url|http://www.varnish-cache.org/^0|F|7|0|0|0|0|V|A|0^^$0|@$1|2|3|4|5|6|7|W|8|@]|9|@$A|X|B|Y|1|Z]]|C|$]]|$1|D|3|E|5|6|7|10|8|@]|9|@]|C|$]]|$1|F|3|G|5|H|7|11|8|@]|9|@]|C|$I|J]]|$1|K|3|L|5|6|7|12|8|@$A|13|B|14|M|N]]|9|@]|C|$]]|$1|O|3|-4|5|6|7|15|8|@]|9|@]|C|$]]]|P|$Q|$5|R|S|T|C|$U|V]]]]

My preference is to use a caching reverse proxy, like <a href="http://www.varnish-cache.org/" rel="noreferrer">Varnish</a>.

As far as a pure PHP solution, you could have some code at the end of your script that caches the final output, and code at the beginning that checks to see if the page is cached. If the page was found in cache, send it and exit rather than running the queries again.

<pre><code>&lt;?php

function cache_file() {
 // something to (hopefully) uniquely identify the resource
 $cache_key = md5($_SERVER['HTTP_HOST'] . $_SERVER['REQUEST_URI'] . $_SERVER['QUERY_STRING']);
 $cache_dir = '/tmp/phpcache';

 return $cache_dir . '/' . $cache_key;
}

// if we have a cache file, deliver it
if( is_file( $cache_file = cache_file() ) ) {
 readfile( $cache_file );
 exit;
}

// cache via output buffering, with callback
ob_start( 'cache_output' );

//
// expensive processing happens here, along with page output.
//

function cache_output( $content ) {
 file_put_contents( cache_file(), $content );
 return $content;
}
</code></pre>

Obviously this needs lots of customization for your setup, including cache expiration, a <code>$cache_key</code> that meets your needs, and error detection so bad pages aren't cached.

blocks|key|921282|text|我使用的是phpFastCache+(用于共享主机，如果你不想使用php.ini和root来设置memcached)。查看示例菜单。他们有完整详细的例子，而且非常简单。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|921283|首先使用phpFastCache::set进行设置，然后使用phpFastCache::get+-+DONE进行获取！|921284|示例:减少数据库调用|921285|您的网站有10,000名在线访问者，而您的动态页面在每次加载页面时都必须向数据库发送10,000个相同的查询。使用phpFastCache，您的页面只向DB发送一个查询，并使用缓存为9999个其他访问者提供服务。|921286|<?php
++++//+In+your+config+file
++++include("php_fast_cache.php");
++++phpFastCache::$storage+=+"auto";
++++//+you+can+set+it+to+files,+apc,+memcache,+memcached,+pdo,+or+wincache
++++//+I+like+auto

++++//+In+your+Class,+Functions,+PHP+Pages
++++//+try+to+get+from+Cache+first.
++++$products+=+phpFastCache::get("products_page");

++++if($products+==+null)+{
++++++++$products+=+YOUR+DB+QUERIES+%7C%7C+GET_PRODUCTS_FUNCTION;
++++++++//+set+products+in+to+cache+in+600+seconds+=+5+minutes
++++++++phpFastCache::set("products_page",$products,600);
++++}

+++OUTPUT+or+RETURN+your+$products
?>|code-block|syntax|javascript|921287|entityMap|0|LINK|mutability|MUTABLE|url|http://www.phpfastcache.com/^0|5|C|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|W|8|@]|9|@$A|X|B|Y|1|Z]]|C|$]]|$1|D|3|E|5|6|7|10|8|@]|9|@]|C|$]]|$1|F|3|G|5|6|7|11|8|@]|9|@]|C|$]]|$1|H|3|I|5|6|7|12|8|@]|9|@]|C|$]]|$1|J|3|K|5|L|7|13|8|@]|9|@]|C|$M|N]]|$1|O|3|-4|5|6|7|14|8|@]|9|@]|C|$]]]|P|$Q|$5|R|S|T|C|$U|V]]]]

I am using <a href="http://www.phpfastcache.com">phpFastCache</a> ( for shared hosting, if you don't want to touch php.ini and root to setup memcached). Check out the Example Menu. They have full detail example, and very easy.

First you set with phpFastCache::set and then get with phpFastCache::get - DONE!

Example: Reduce Database Calls

Your website have 10,000 visitors who are online, and your dynamic page have to send 10,000 same queries to database on every page load. With phpFastCache, your page only send 1 query to DB, and use the cache to serve 9,999 other visitors.

<pre><code>&lt;?php
 // In your config file
 include("php_fast_cache.php");
 phpFastCache::$storage = "auto";
 // you can set it to files, apc, memcache, memcached, pdo, or wincache
 // I like auto

 // In your Class, Functions, PHP Pages
 // try to get from Cache first.
 $products = phpFastCache::get("products_page");

 if($products == null) {
 $products = YOUR DB QUERIES || GET_PRODUCTS_FUNCTION;
 // set products in to cache in 600 seconds = 5 minutes
 phpFastCache::set("products_page",$products,600);
 }

 OUTPUT or RETURN your $products
?&gt;
</code></pre>

blocks|key|1135900|text|++++<?php
++++//settings
++++$cache_ext++=+'.html';+//file+extension
++++$cache_time+++++=+3600;++//Cache+file+expires+afere+these+seconds+(1+hour+=+3600+sec)
++++$cache_folder+++=+'cache/';+//folder+to+store+Cache+files
++++$ignore_pages+++=+array('',+'');

++++$dynamic_url++++=+'http://'.$_SERVER['HTTP_HOST']+.+$_SERVER['REQUEST_URI']+.+$_SERVER['QUERY_STRING'];+//+requested+dynamic+page+(full+url)
++++$cache_file+++++=+$cache_folder.md5($dynamic_url).$cache_ext;+//+construct+a+cache+file
++++$ignore+=+(in_array($dynamic_url,$ignore_pages))?true:false;+//check+if+url+is+in+ignore+list

++++if+(!$ignore+&&+file_exists($cache_file)+&&+time()+-+$cache_time+<+filemtime($cache_file))+{+//check+Cache+exist+and+it's+not+expired.
++++++++ob_start('ob_gzhandler');+//Turn+on+output+buffering,+"ob_gzhandler"+for+the+compressed+page+with+gzip.
++++++++readfile($cache_file);+//read+Cache+file
++++++++echo+'';
++++++++ob_end_flush();+//Flush+and+turn+off+output+buffering
++++++++exit();+//no+need+to+proceed+further,+exit+the+flow.
++++}
++++//Turn+on+output+buffering+with+gzip+compression.
++++ob_start('ob_gzhandler');
++++########+Your+Website+Content+Starts+Below+#########
++++?>
++++<!DOCTYPE+html>
++++<html>
++++++++<head>
++++++++++++<title>Page+to+Cache</title>
++++++++</head>
++++++++++++<body>
++++++++++++++++Lorem+ipsum+dolor+sit+amet,+consectetur+adipiscing+elit.+Integer+ut+tellus+libero.
++++++++++++</body>
++++</html>
++++<?php
++++########+Your+Website+Content+Ends+here+#########

++++if+(!is_dir($cache_folder))+{+//create+a+new+folder+if+we+need+to
++++++++mkdir($cache_folder);
++++}
++++if(!$ignore){
++++++++$fp+=+fopen($cache_file,+'w');++//open+file+for+writing
++++++++fwrite($fp,+ob_get_contents());+//write+contents+of+the+output+buffer+in+Cache+file
++++++++fclose($fp);+//Close+file+pointer
++++}
++++ob_end_flush();+//Flush+and+turn+off+output+buffering

++++?>|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|1135901|unstyled|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|G|8|@]|9|@]|A|$B|C]]|$1|D|3|-4|5|E|7|H|8|@]|9|@]|A|$]]]|F|$]]

<pre><code> &lt;?php
 //settings
 $cache_ext = '.html'; //file extension
 $cache_time = 3600; //Cache file expires afere these seconds (1 hour = 3600 sec)
 $cache_folder = 'cache/'; //folder to store Cache files
 $ignore_pages = array('', '');

 $dynamic_url = 'http://'.$_SERVER['HTTP_HOST'] . $_SERVER['REQUEST_URI'] . $_SERVER['QUERY_STRING']; // requested dynamic page (full url)
 $cache_file = $cache_folder.md5($dynamic_url).$cache_ext; // construct a cache file
 $ignore = (in_array($dynamic_url,$ignore_pages))?true:false; //check if url is in ignore list

 if (!$ignore &amp;&amp; file_exists($cache_file) &amp;&amp; time() - $cache_time &lt; filemtime($cache_file)) { //check Cache exist and it's not expired.
 ob_start('ob_gzhandler'); //Turn on output buffering, "ob_gzhandler" for the compressed page with gzip.
 readfile($cache_file); //read Cache file
 echo '&lt;!-- cached page - '.date('l jS \of F Y h:i:s A', filemtime($cache_file)).', Page : '.$dynamic_url.' --&gt;';
 ob_end_flush(); //Flush and turn off output buffering
 exit(); //no need to proceed further, exit the flow.
 }
 //Turn on output buffering with gzip compression.
 ob_start('ob_gzhandler');
 ######## Your Website Content Starts Below #########
 ?&gt;
 &lt;!DOCTYPE html&gt;
 &lt;html&gt;
 &lt;head&gt;
 &lt;title&gt;Page to Cache&lt;/title&gt;
 &lt;/head&gt;
 &lt;body&gt;
 Lorem ipsum dolor sit amet, consectetur adipiscing elit. Integer ut tellus libero.
 &lt;/body&gt;
 &lt;/html&gt;
 &lt;?php
 ######## Your Website Content Ends here #########

 if (!is_dir($cache_folder)) { //create a new folder if we need to
 mkdir($cache_folder);
 }
 if(!$ignore){
 $fp = fopen($cache_file, 'w'); //open file for writing
 fwrite($fp, ob_get_contents()); //write contents of the output buffer in Cache file
 fclose($fp); //Close file pointer
 }
 ob_end_flush(); //Flush and turn off output buffering

 ?&gt;
</code></pre>

blocks|key|1135990|text|在讨论缓存时，经常忽略的重要一点是进程同步，以避免线程争用(参见：https://en.wikipedia.org/wiki/Race_condition)。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1135991|PHP中没有同步的典型缓存场景是这样的:如果缓存中没有资源，或者资源已过期，则必须创建它并将其放入缓存中。碰巧遇到这种情况的第一个线程/进程正在尝试创建资源，在此期间，其他线程也将创建该资源，这将导致线程争用、缓存崩溃和性能下降。|1135992|问题会因并发线程数和资源创建任务产生的工作负载而放大。在繁忙的系统上，这可能会导致严重的问题。|1135993|很少有PHP的缓存系统会考虑到同步。|1135994|其中之一是php-no-slam+cache：https://github.com/tztztztz/php-no-slam-cache|1135995|entityMap|0|LINK|mutability|MUTABLE|url|https://en.wikipedia.org/wiki/Race_condition|1|https://github.com/tztztztz/php-no-slam-cache^0|X|18|0|0|0|0|0|N|19|1|0^^$0|@$1|2|3|4|5|6|7|V|8|@]|9|@$A|W|B|X|1|Y]]|C|$]]|$1|D|3|E|5|6|7|Z|8|@]|9|@]|C|$]]|$1|F|3|G|5|6|7|10|8|@]|9|@]|C|$]]|$1|H|3|I|5|6|7|11|8|@]|9|@]|C|$]]|$1|J|3|K|5|6|7|12|8|@]|9|@$A|13|B|14|1|15]]|C|$]]|$1|L|3|-4|5|6|7|16|8|@]|9|@]|C|$]]]|M|$N|$5|O|P|Q|C|$R|S]]|T|$5|O|P|Q|C|$R|U]]]]

The important thing, often overlooked when there is discussion about caching, is process synchronization to avoid thread race (see: <a href="https://en.wikipedia.org/wiki/Race_condition" rel="nofollow noreferrer">https://en.wikipedia.org/wiki/Race_condition</a>).

Typical caching scenario in PHP without synchronization looks like this: if you don't have resource in the cache, or resource is expired, it must be created and put into cache. First thread/process that happens to encounter such condition is trying to create resource, and during that time, other threads will also create the resource, which leads to thread race, cache slamming and performance downspike.

Problem is magnified by number of concurrent threads and workload created by resource creation task. On busy systems it may lead to serious problems.

There is very few caching systems for PHP that takes it into consideration synchronization.

One of them is php-no-slam-cache: <a href="https://github.com/tztztztz/php-no-slam-cache" rel="nofollow noreferrer">https://github.com/tztztztz/php-no-slam-cache</a>

How to cache PHP page which has mysql query. Any example will be great and helpful.

How to cache dynamic PHP page

数据库

如何缓存有mysql查询的PHP页面。任何一个例子都是很好的，也是有帮助的。

问如何缓存动态PHP页面
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