解析php中memcache的应用

//连接
$mem = new Memcache;
$mem->connect("127.0.0.1",11211);
//保存数据
$mem->set('key1','This is first value',60);
$val = $mem->get('key1');
echo "Get key1 value: " . $val ."
";
//替换数据
$mem->replace('key1','This is replace value',60);
$val = $mem->get('key1');
echo "Get key1 value: " . $val . "
";
//保存数组
$arr = array('aaa','bbb','ccc','ddd');
$mem->set('key2',$arr,60);
$val2 = $mem->get('key2');
echo "Get key2 value: ";
print_r($val2);
echo "
";
//删除数据
$mem->delete('key1');
$val = $mem->get('key1');
echo "Get key1 value: " . $val . "
";
//清除所有数据
$mem->flush();
$val2 = $mem->get('key2');
echo "Get key2 value: ";
print_r($val2);
echo "
";
//关闭连接
$mem->close();
$memcachehost = '192.168.10.1';
$memcacheport = 11211;
$memcachelife = 60;
$memcache = new Memcache;
$memcache->connect($memcachehost,$memcacheport) or die ("Could not connect");
$query="select * from user limit 10";
$key=md5($query);
if(!$memcache->get($key))
{
$conn=mysql_connect("192.168.30.1","root","passwd");
mysql_select_db(users);
$result=mysql_query($query);
while ($row=mysql_fetch_assoc($result))
{
$arr[]=$row;
}
$f = 'db';
$memcache->add($key,serialize($arr),30);
$data = $arr ;
}
else{
$f = 'mem';
$data_mem=$memcache->get($key);
$data = unserialize($data_mem);
}
echo $f;
echo "";
//print_r($data);
foreach($data as $a)
{
echo $a[user_id]._.$a[email];
echo "";
}
?>

//==============memcache
$memcachehost = '127.0.0.1';
$memcacheport = 11211;
$memcachelife = 60;
$memcache = new Memcache;
$memcache->connect($memcachehost,$memcacheport) or die ("Could not connect");
//==============新闻
$sql="SELECT id,title,left(title,16) as biaoti,date_time FROM `p_newsbase` where shenhe='1' order by id DESC limit 7 ";
$query=$db->query($sql);
$key=md5($query);
while($row_news=$db->fetch_array($query)){
$str=$row_news['biaoti'].$db->time_out($row_news['date_time']);
$sm_news[]=array("name"=>$str,"title"=>$row_news['title'],"id"=>$row_news['id'],"date_time"=>$row_news['date_time']);
}
if(!$memcache->get($key)){
$memcache->add($key,serialize($sm_news),$memcachelife);
}else{
$data_mem=$memcache->get($key);
$sm_news = unserialize($data_mem);
}
$smarty->assign("sm_news",$sm_news);