Memcache函数库是在 PECL(PHP Extension Community Library)中，主要作用是搭建大容量的内存数据的
临时存放区域，在分布式的时候作用体现的非常明显，否则不建议使用。 本人在ubuntu上安装
完运行的时候报错：
/usr/local/memcached/bin/memcached: error while loading shared libraries: libevent-1.4.so.2:
cannot open shared object file: No such file or directory
按照：《libeven、memcached、libmemcache安装》中的方法，使用：
sudo ln -s /usr/local/lib/libevent-1.4.so.2 /usr/lib/libevent-1.4.so.2
可以修正这个BUG
通过新得立安装php的memcached模块，注销/etc/php5/conf.d/memcached.ini里面的“;”，重启apache
，调用phpinfo()出现memcached的信息
执行：
$memcache = new Memcache;
$memcache->connect(localhost, 11211) or die ("Could not connect");
$version = $memcache->getVersion();
echo "Servers version: ".$version."
";
?>
$memcache = new Memcache;
$memcache->connect(localhost, 11211) or die ("Could not connect");
print_r($memcache->getStats());
/**
* Array
* (
* [pid] => 8052
* [uptime] => 9205
* [time] => 1205898428
* [version] => 1.2.5
* [pointer_size] => 32
* [rusage_user] => 0.008000
* [rusage_system] => 0.000000
* [curr_items] => 1
* [total_items] => 17
* [bytes] => 57
* [curr_connections] => 2
* [total_connections] => 15
* [connection_structures] => 3
* [cmd_get] => 9
* [cmd_set] => 23
* [get_hits] => 5
* [get_misses] => 4
* [evictions] => 0
* [bytes_read] => 671
* [bytes_written] => 850
* [limit_maxbytes] => 10485760
* [threads] => 1
* )
*/
?>
$memcache = new Memcache;
$memcache->connect(localhost, 11211) or die ("Could not connect");
$memcache->set( name, leo, 0, 30);
if(!$memcache->add( name, susan, 0, 30))
{
echo susan is exist;
};
$memcache->replace
