PHP编程：PHP中Memcache操作类及用法实例

<?php?
??? /*? 内存缓存管理?
??? */
class Yc_Memcache{?
?private $memcache=null;??
??
?public function __construct(){?
?}?
?/**?
??? * 连接数据库?
??? *?
??? * @param mixed $host?
??? * @param mixed $port?
??? * @param mixed $timeout?
??? */
?public? function connect($host,$port=11211,$timeout=1){?
? if(!function_exists(memcache_connect)){ return FALSE;}?
? $this->memcache=@memcache_connect($host,$port,$timeout);?
? if(emptyempty($this->memcache)){?
?? return FALSE;?
? }else{?
?? return TRUE;?
? }?
?}?
??? /**?
??? * 存放值?
??? *?
??? * @param mixed $key?
??? * @param mixed $var?
??? * @param mixed $flag?? 默认为0不压缩? 压缩状态填写：MEMCACHE_COMPRESSED?
??? * @param mixed $expire? 默认缓存时间(单位秒)?
??? */
?public function set($key,$var,$flag=0,$expire=10){?
??
? $f=@memcache_set($this->memcache,$key,$flag,$expire);?
? if(emptyempty($f)){?
?? return FALSE;?
? }else{?
?? return TRUE;?
? }?
?}?
??? /**?
??? * 取出对应的key的value?
??? *?
??? * @param mixed $key?
??? * @param mixed $flags?
??? * $flags 如果此值为1表示经过序列化,?
??? * 但未经过压缩,2表明压缩而未序列化,?
??? * 3表明压缩并且序列化,0表明未经过压缩和序列化?
??? */
?public function get($key,$flags=0){?
? $val=@memcache_get($this->memcache,$flags);?
? return $val;?
?}?
?/**?
??? * 删除缓存的key?
??? *?
??? * @param mixed $key?
??? * @param mixed $timeout?
??? */
?public function delete($key,$timeout=1){?
? $flag=@memcache_delete($this->memcache,$timeout);?
? return $flag;?
?}?
??? /**?
??? * 刷新缓存但不释放内存空间?
??? *?
??? */
?public function flush(){?
? memcache_flush($this->memcache);?
?}?
??? /**?
??? * 关闭内存连接?
??? *?
??? */
?public function close(){?
? memcache_close($this->memcache);?
?}?
??? /**?
??? * 替换对应key的value?
??? *?
??? * @param mixed $key?
??? * @param mixed $var?
??? * @param mixed $flag?
??? * @param mixed $expire?
??? */
?public function replace($key,$expire=1){?
? $f=memcache_replace($this->memcache,$expire);?
? return $f;?
?}?
??? /**?
??? * 开启大值自动压缩?
??? *?
??? * @param mixed $threshold 单位b?
??? * @param mixed $min_saveings 默认值是0.2表示20%压缩率?
??? */
?public function setCompressThreshold($threshold,$min_saveings=0.2){?
? $f=@memcache_set_compress_threshold($this->memcache,$threshold,$min_saveings);?
? return $f;?
?}?
??? /**?
??? * 用于获取一个服务器的在线/离线状态?
??? *?
??? * @param mixed $host?
??? * @param mixed $port?
??? */
?public function getServerStatus($host,$port=11211){?
? $re=memcache_get_server_status($this->memcache,$host,$port);?
? return $re;?
?}?
??? /**?
??? * 缓存服务器池中所有服务器统计信息?
??? *?
??? * @param mixed $type 期望抓取的统计信息类型,可以使用的值有{reset,malloc,maps,cachedump,slabs,items,sizes}?
??? * @param mixed $slabid? cachedump命令会完全占用服务器通常用于 比较严格的调?
??? * @param mixed $limit 从服务端获取的实体条数?
??? */
?public function getExtendedStats($type='',$slabid=0,$limit=100){?
? $re=memcache_get_extended_stats($this->memcache,$type,$slabid,$limit);
? return $re;?
?}?
}?
??
/***********测试区域********************/
$mem=new Yc_Memcache();?
??
$f=$mem->connect('125.64.41.138',12000);?
var_dump($f);?
if($f){?
// $mem->setCompressThreshold(2000,0.2);?
?$mem->set('key','hello',30);?
//??????? var_dump($mem->delete('key1'));?
?// $mem->flush();?
// var_dump($mem->replace('hao','d'));?
// echo $mem->get('key');?
?echo $mem->getServerStatus('127.0.0.1',12000);?
?echo $mem->get('key');?
?echo '<pre>';?
?print_r($mem->getExtendedStats());?
}?
??
?>