phpcms缓存使用总结(memcached、eaccelerator、shm)

function template($module = 'phpcms', $template = 'index')
{
global $CONFIG;
$compiledtplfile = $CONFIG['templatescachedir'].$module.'_'.$template.'.tpl.php';
if($CONFIG['templaterefresh'])
{
$tplfile = PHPCMS_ROOT.'/templates/'.$CONFIG['defaulttemplate'].'/'.$module.'/'.$template.'.html';
if(!file_exists($compiledtplfile) || @filemtime($tplfile) > @filemtime($compiledtplfile))
{
require_once PHPCMS_ROOT.'/include/template.func.php';
template_refresh($tplfile, $compiledtplfile);
}
}
return $compiledtplfile;
}

<?php
require_once './include/common.inc.php';
$lastedittime = @filemtime('index_cache.html');
$lastedittime = $PHP_TIME-$lastedittime;
$autoupdatetime = intval($MOD['autoupdate']); //$MOD['autoupdate']来自缓存文件data/cache/wenba_setting.php中的内容
if(file_exists('index_cache.html') && $lastedittime<$autoupdatetime)
{ 
echo "include cache file";
include 'index_cache.html';
}
else
{
echo "read dynamic page";
...
?>

<?php
return array (
'higth_score' => '100',
'anybody_score' => '2',
'answer_give_credit' => '5',
'vote_give_credit' => '1',
'highscore' => '2',
'vote_give_actor' => '公司白领</p> <p>魔法师</p> <p>科举夺魁</p> <p>武将</p> <p>江湖奇侠',
'autoupdate' => '10',
'name' => '问吧',
'moduledir' => 'wenba',
'moduledomain' => '',
'linkurl' => '/opensource/phpcms2007_sp6_gbk/phpcms/wenba/',
);
?>

function module_setting($module, $setting)
{
global $db,$MODULE,$LANG;
if(!is_array($setting) || !array_key_exists($module,$MODULE)) return FALSE;
if(isset($setting['moduledomain']))
{
$moduledomain = $setting['moduledomain'];
$db->query("UPDATE ".TABLE_MODULE." SET moduledomain='$moduledomain' WHERE module='$module'");
unset($setting['moduledomain']);
}
$setting = addslashes(serialize(new_stripslashes($setting)));
//将某个模块的多个设置的值经数组序列化以后保存在一个字段setting中
$db->query("UPDATE ".TABLE_MODULE." SET setting='$setting' WHERE module='$module'");
cache_module($module);
cache_common();
return TRUE;
}

<?php
chdir('../ads/');
require './ad.php';
?>

<?php
define('SHOWJS', 1);
require './include/common.inc.php';
require MOD_ROOT.'/include/global.func.php';</p> <p>$placeid = intval($id);</p> <p>$query ="SELECT * FROM ".TABLE_ADS." AS a LEFT JOIN ".TABLE_ADS_PLACE." AS p ON (a.placeid=p.placeid) WHERE a.placeid=".$placeid." AND a.fromdate<=UNIX_TIMESTAMP() AND a.todate>=UNIX_TIMESTAMP() AND p.passed=1 AND a.passed=1 AND a.checked=1 ORDER BY a.addtime";
$ads = $db->get_one($query, "CAHCE", 10240);
if(!$ads) exit('document.write("")');</p> <p>$db->query("UPDATE ".TABLE_ADS." SET views=views+1 WHERE adsid=".$ads['adsid']);</p> <p>$content = ads_content($ads);
$templateid = $ads['templateid'] ? $ads['templateid'] : 'ads';
include template('ads', $templateid);
phpcache();
?>

function phpcache($is_js = 0)
{
global $CONFIG,$cachefiledir,$cachefile;
if(!$is_js && $CONFIG['phpcache'] != '2') return FALSE;
$contents = ob_get_clean(); //读取缓冲区里面的内容
if($is_js) $contents = strip_js($contents);
if($CONFIG['phpcache'] == '2' && $cachefiledir && $cachefile)
{
dir_create($cachefiledir);
file_put_contents($cachefile, $contents); //在这儿生成一个.html格式的文件,当下次以同样的url访问时，会直接读取缓存了，参见include/common.inc.php中的代码，这儿的代码是非常非常精典的，大家好好借鉴、好好模仿吧
@chmod($cachefile, 0777);
}
/*
向浏览器发送http header，跟浏览器说，此页面不缓存，还告诉浏览器页面的最后修改时间
第一次访问js.php?id=1时向浏览器发送http header,第二次或以后再访问此url时，由于上次已经生成了缓存，所以在include/common.inc.php中直接调用缓存文件了，直到 缓存失效后再次执行此处的动态代码。此处发送的header控制缓存是相对于浏览器来说的;而通过file_put_contents生成的缓存是相对于 电脑硬盘来说的，是不一样的。
*/
header('Expires: Mon, 26 Jul 2000 05:00:00 GMT'); 
header('Last-Modified: '.gmdate('D, d M Y H:i:s').' GMT'); 
header('Cache-Control: no-cache, must-revalidate');
header('Pragma: no-cache');
echo $contents;
}

if(!defined('IN_ADMIN'))
{
if($CONFIG['dbiscache']) $db_file .= '_cache';
if($CONFIG['phpcache'] == '2')
{
$cachefileid = md5($PHP_SELF.'?'.$PHP_QUERYSTRING);
$cachefiledir = PHPCMS_ROOT.'/data/phpcache/'.substr($cachefileid, 0, 2).'/';
$cachefile = $cachefiledir.$cachefileid.'.html';
//echo "cachefile:$cachefile";
if(file_exists($cachefile) && ($PHP_TIME < @filemtime($cachefile) + $CONFIG['phpcacheexpires']))
{
require $cachefile;
exit;
}
}
if($PHP_QUERYSTRING && preg_match("/^(.*)\.(htm|html|shtm|shtml)$/", $PHP_QUERYSTRING, $urlvar))
{
parse_str(str_replace(array('/', '-', ' '), array('&', '=', ''), $urlvar[1]));
}
}

$db_file = $db_class = 'db_'.$CONFIG['database']; //$CONFIG['database']位于config.inc.php中，配置可以使用自己的数据库，如mysql,sqlite,sqlserver等
require PHPCMS_ROOT.'/include/'.$db_file.'.class.php';
$db = new $db_class;
$db->connect($CONFIG['dbhost'], $CONFIG['dbuser'], $CONFIG['dbpw'], $CONFIG['dbname'], $CONFIG['pconnect']);
$db->iscache = $CONFIG['dbiscache']; //是否启用 sql cache (只对前台起作用，建议在不生成html并且访问量过大时开启)
$db->expires = $CONFIG['dbexpires']; //sql cache 过期时间(秒)

function query($sql , $type = '' , $expires = 3600, $dbname = '') 
{
if($this->isclient)
{
$dbname = $dbname ? $dbname : $this->dbname;
$this->select_db($dbname);
}
/*
$this->iscache表示是否启动了数据库查询缓存
如果启用了数据库查询缓存且$type为CACHE且是select语句，则启用查询缓存
个人感觉这儿$type参数用strtoupper处理一下更好了
*/
if($this->iscache && $type == 'CACHE' && stristr($sql, 'SELECT'))
{
$this->caching = 1; //成员变量caching标识启用了数据库查询缓存，用在下面的fetch_array,num_rows,free_result函数中，其实用iscache就可以判断了，没有必要再用一个成员变量了
$this->expires = $expires; //数据库缓存数据的失效期
return $this->_query_cache($sql); //然后调用_query_cache方法
}
$this->caching = 0;
$func = $type == 'UNBUFFERED' ? 'mysql_unbuffered_query' : 'mysql_query';
if(!($query = $func($sql , $this->connid)) && $type != 'SILENT')
{
$this->halt('MySQL Query Error', $sql);
}
$this->querynum++;
return $query;
}</p> <p>function _query_cache($sql)
{
$this->cache_id = md5($sql); //计算$sql的md5值，然后作为cache_id
$this->result = array();
$this->cursor = 0;
$this->cache_file = $this->_get_file(); //得到cache文件名
//如果cache数据已经过期，则重新从数据库中取得查询结果，然后保存在数据库中
if($this->_is_expire())
{
$this->result = $this->_get_array($sql); //从数据库中取结果
$this->_save_result(); //保存结果到缓存数据中
}
else
{
$this->result = $this->_get_result(); //缓存没过期直接取缓存数据
}
return $this->result;
}</p> <p> function _get_file()
{
global $CONFIG;
//cache文件的主目录一般是data/dbcache
return $CONFIG['dbcachedir'].substr($this->cache_id, 0, 2).'/'.$this->cache_id.'.php';
}</p> <p>function _is_expire()
{
global $PHP_TIME;
return !file_exists($this->cache_file) || ( $PHP_TIME > @filemtime($this->cache_file) + $this->expires );
}</p> <p>/*
由于方法_get_array只是被方法_query_cache调用，所以在此方法里面直接用函数mysql_unbuffered_query了，因为mysql_unbuffered性能好一点，参考
<a href="http://bbs.chinaunix.net/viewthread.php?tid=958067&extra=page%3D4">http://bbs.chinaunix.net/viewthread.php?tid=958067&extra=page%3D4</a>
*/
function _get_array($sql)
{
$this->cursor = 0;
$arr = array();
$result = mysql_unbuffered_query($sql, $this->connid);
while($row = mysql_fetch_assoc($result))
{
$arr[] = $row;
}
$this->free_result($result);
$this->querynum++;
return $arr;
}</p> <p>function _save_result()
{
if(!is_array($this->result)) return FALSE;
dir_create(dirname($this->cache_file));
file_put_contents($this->cache_file, "<?php\n return ".var_export($this->result, TRUE).";\n?>");
@chmod($this->cache_file, 0777);
}</p> <p> function _get_result()
{
return include $this->cache_file;
}</p> <p>function fetch_array($query, $result_type = MYSQL_ASSOC)
{
return $this->caching ? $this->_fetch_array($query) : mysql_fetch_array($query, $result_type);
}</p> <p>//从数据库中获取查询的结果
function _fetch_array($result = array())
{
if($result) $this->result = $result;
return isset($this->result[$this->cursor]) ? $this->result[$this->cursor++] : FALSE;
}</p> <p>function num_rows($query)
{
return $this->caching ? $this->_num_rows($query) : mysql_num_rows($query);
}</p> <p>function free_result($query)
{
if($this->caching==1) $this->result = array();
else @mysql_free_result($query);
}