本文实例讲述了php内存缓存实现方法。分享给大家供大家参考。具体如下:
在php中缓存分为很多种类型如,内存缓存,文件缓存,页面缓存。本文要来讲述关于php中内存缓存的一些方法,这里我们将介绍Memcached缓存和php自带的APC缓存方法.
1.Memcached缓存。
memcached是高性能的分布式内存缓存服务器,通过缓存数据库查询结果,减少数据库访问次数,以提高动态Web应用的速度,memcached 使用了“Key=>Value”方式组织数据,可以允许不同主机上的多个用户同时访问这个缓存系统,一般用于大型网站使用,memcached使用内存缓存数据,所以它是易失的,当服务器重启,或者memcached进程中止,数据便会丢失,所以 memcached不能用来持久保存数据.
用过php_memcache的人都会觉得 PHP内存缓存是一个很复杂的东西,其实不然memcached 是高效、快速的分布式内存对象缓存系统,主要用于加速 WEB 动态应用程序.
这里介绍memcached在WIN32下的配置及其使用.
一、PHP内存缓存的配置,WIN32环境
1、下载php_memcache.rar
解压压缩包:php_memcache.rar
php_memcache.rar压缩包里主包含的文件有:
/memcached-1.2.1-win32/memcached.exe
/php_memcache/php_memcache.dll
2、打开命令提示符,指向到memcached.exe所在路径,运行memcached.exe -d start。
3、将php_memcache.dll文件拷贝到PHP的动态文件库的文件夹下。
4、在php.ini文件中加入一行extension=php_memcache.dll。
5、重新启动Apache,然后查看一下phpinfo,如果有memcache,那么就说明安装成功!
例,代码如下:
代码如下:
//包含 memcached 类文件
require_once('memcached-client.php');
//选项设置
$options = array(
'servers' => array('www.bitsCN.com:11211'),//memcached 服务的地址、端口
'debug' => true,//是否打开debug
'compress_threshold' => 10240,//超过多少字节的数据时进行压缩
'persistant' => false//是否使用持久连接
);
//实例化memcached对象
$memcached = new memcached($options);
$sql = 'SELECT * FROM table1';
$key = md5($sql);
//如果在memcached中没有缓存数据,把缓存数据写入memcached
if(!($datas = $memcached->get($key)))
{
$conn = mysql_connect('localhost', 'hxsd', '123456');
mysql_select_db('hxsd');
$result = mysql_query($sql);
while($row = mysql_fetch_object($result))
{
$datas[] = $row;
}
//将数据库中获取到的结果集数据保存到 memcached 中,以供下次访问时使用。
$memcached->add($key, $datas);
}
else
{
//直接使用memcached中的缓存数据$datas
}
?>
内存缓存二,APC、EC、Zend加速器的比较
一、APC
APC,全称是Alternative PHP Cache,官方翻译叫”可选PHP缓存”,主页是 http://pecl.php.net/package/apc,php帮助手册页面: http://cn.php.net/apc
APC是个优化器,自安装之日起,就默默地在后台为您的PHP应用服务了.您的所有PHP代码会被缓存起来,针对php opcode.
另外,APC可提供一定的内存缓存功能.但是这个功能并不是十分完美,有报告说如果频繁使用APC缓存的写入功能,会导致不可预料的错误.如果想使用这个功能,可以看看apc_fetch,apc_store等几个与apc缓存相关的函数.
安装,代码如下:
代码如下:
# pecl install APC
配置:/etc/php.inc,代码如下:
代码如下:
extension=apc.so
[apc]
代码如下:
apc.enabled = 1
apc.shm_segments = 1
apc.shm_size = 30
apc.optimization = 0
apc.ttl = 7200
apc.user_ttl = 7200
apc.num_files_hint = 1000
apc.mmap_file_mask = /tmp/apc.XXXXXX
希望本文所述对大家的php程序设计有所帮助。

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