php中的memcache应用（转）

本文转自：http://www.php100.com/html/itnews/it/2013/0222/12097.html

所需环境：

php 5.3.3

apache 2.2.7

mysql 5.5.8

解压Memcached_1.2.5文档，cmd下执行memcached.exe -d -install

将php5.3_vc6_memcachedll文档解压，将php_memcache.dll文件复制到php安装目录的ext文件目录中。

然后在php.ini 当中填上这句话：extension="php_memcache.dll"

在phpinfo（）下查看，是否引用了memcache扩展。

 

测试代码：

1. <?php  
   //连接  
   $mem = new Memcache;  
   $mem->connect("127.0.0.1", 11211);  
     
   //保存数据  
   $mem->set('key1', 'This is first value', 0, 60);  
   $val = $mem->get('key1');  
   echo "Get key1 value: " . $val ."<br />";  
     
   //替换数据  
   $mem->replace('key1', 'This is replace value', 0, 60);  
   $val = $mem->get('key1');  
   echo "Get key1 value: " . $val . "<br />";  
     
   //保存数组  
   $arr = array('aaa', 'bbb', 'ccc', 'ddd');  
   $mem->set('key2', $arr, 0, 60);  
   $val2 = $mem->get('key2');  
   echo "Get key2 value: ";  
   print_r($val2);  
   echo "<br />";  
     
   //删除数据  
   $mem->delete('key1');  
   $val = $mem->get('key1');  
   echo "Get key1 value: " . $val . "<br />";  
     
   //清除所有数据  
   $mem->flush();  
   $val2 = $mem->get('key2');  
   echo "Get key2 value: ";  
   print_r($val2);  
   echo "<br />";  
   //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),0,30);  
           $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 "";  
   }  
   ?> 

    

    

 

新闻系统的应用：

1. //==============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($sm_news),0,$memcachelife);  
    }else{  
       $data_mem=$memcache->get($key);  
       $sm_news = unserialize($data_mem);  
    }  
    $smarty->assign("sm_news",$sm_news);