php中memcache的运用

 <?php
 /**
  * •Memcache::add — 增加一个条目到缓存服务器
  * •Memcache::addServer — 向连接池中添加一个memcache服务器
  * •Memcache::close — 关闭memcache连接
  * •Memcache::delete — 从服务端删除一个元素
  * •Memcache::get — 从服务端检回一个元素
  * •Memcache::set — 在服务器上存储数据
  * •Memcache::flush — 清洗（删除）已经存储的所有的元素
  * •Memcache::getStats — 获取服务器统计信息
  * •Memcache::pconnect — 打开一个到服务器的持久化连接
  * •Memcache::replace — 替换已经存在的元素的值
  * 使用MEMCACHE_COMPRESSED标记对数据进行压缩(使用zlib)。
  * •Memcache::connect — 打开一个memcached服务端连接
  * 同一个项目安装两次,key要有前缀
  * memcache安全(不让别人访问)
  * 内网,设置防火墙,
  * Iptables -A INPUT -p tcp 192.168.1.111 -dport 11211 -j ACCEPT
  * Iptables -A INPUT -p ucp 192.168.1.111 -dport 11211 -j ACCEPT
  */
 $men=new Memcache; //实例化一个memcache类
 //var_dump($men); // 返回一个对象 object(Memcache)[1]
 $men->addServer();
 $men->add('mytest','today is tuesday'); //往memcache中写入数据
 $men->set('mytest','22today is tuesday'); //覆盖掉了原来同名的键值
 $str=$men->get('mytest');  //从memcache中读出数据
 $men->add('mytest2','today is tuesday喔喔'); //往memcache中写入数据
 $men->add('myarray',array('aaa','bbb','ccc','ddd'));
 $rs2=$men->get('mytest2');
 $rs4=$men->get('myarray');
 echo $rs2; //today is tuesday喔喔
 $men->replace('mytest2','today is tuesday喔喔2222');
 $rs3=$men->get('mytest2');
 echo $rs3; //today is tuesday喔喔2222
 var_dump($rs4);
 /**
  * array (size=4)
   0 => string 'aaa' (length=3)
   1 => string 'bbb' (length=3)
   2 => string 'ccc' (length=3)
   3 => string 'ddd' (length=3)
  */
 //echo $str; //today is tuesday  22today is tuesday
 $rs=$men->getStats();
 //var_dump($rs);
 /**
  * array (size=20)
   'pid' => string '1984' (length=4)
   'uptime' => string '1474' (length=4)
   'time' => string '1427158094' (length=10)
   'version' => string '1.2.6' (length=5)
   'pointer_size' => string '32' (length=2)
   'curr_items' => string '2' (length=1)
   'total_items' => string '15' (length=2)
   'bytes' => string '153' (length=3)
   'curr_connections' => string '4' (length=1)
   'total_connections' => string '5' (length=1)
   'connection_structures' => string '5' (length=1)
   'cmd_get' => string '30' (length=2)
   'cmd_set' => string '58' (length=2)
   'get_hits' => string '30' (length=2)
   'get_misses' => string '0' (length=1)
   'evictions' => string '0' (length=1)
   'bytes_read' => string '2697' (length=4)
   'bytes_written' => string '3681' (length=4)
   'limit_maxbytes' => string '67108864' (length=8)
   'threads' => string '1' (length=1)
  */

 class Person{
     var $name='zhangsan';
     ;
 }
 $men->add('myobj',new Person);
 $myobj=$men->get('myobj');
 var_dump($myobj);
 /**
  * object(Person)[2]
    public 'name' => string 'zhangsan' (length=8)
    public 'age' => int 10
  */
 echo $men->getVersion(); //1.2.6  版本号
 $men->close();
 ?>