php中memcache 基本操作实例

发布:smiling　来源: PHP粉丝网　添加日期：2021-05-27 10:00:24　浏览: 评论：0　

本文实例讲述了PHP中Memcache的基本操作及用法，分享给大家供大家参考，有需要的小伙伴快来研究下吧。

php中memcache 基本操作实例：

<!DOCTYPE html>

<html>

<head>

<title>memcache demo</title>

<meta http-equiv="content-type"content="text/html;chatset=utf-8">

</head>

<body>

<?php

$server_ip = '127.0.0.1';

$server_port = 11211;

$memcache = new Memcache();

$memcache->connect($server_ip,$server_port);

$memcache->add("name1","user_name1",MEMCACHE_COMPRESSED,0);

$memcache->add("name2","user_name2",MEMCACHE_COMPRESSED,0);

$array1 = array('name1' => 'jiajiam1',

'age1'=>12,

'country'=>'china');

$memcache->add("other",$array1,MEMCACHE_COMPRESSED,20);

$memcache->set("name3","user_name3",MEMCACHE_COMPRESSED,0);

$memcache->replace("name1","user_name_relpace",MEMCACHE_COMPRESSED,0);

$memcache->replace("123","12345");

echo"name1:".$memcache->get("name1")." ";

$memcache->delete("name1");

echo"name1:".$memcache->get("name1")." ";

$array_get = array("name1","name2","name3");

$result_get = $memcache->get($array_get);

foreach ($result_get as $key => $value) {

echo"$key:--->$value ";

}

foreach ($memcache->getStats() as $key => $value) {

echo"$key:--->$value ";

};

echo" ";

foreach($memcache->getExtendedStats() as $key => $value) {

echo"$key:--->$value ";

}

$memcache->close();

?>

</body>

</html>

我们再来看个更加具体些的实例

<?php

include('inc/common.inc.php');

if (! isset($city) || ! is_array($city) ) {

 exit;

}

//print_r ($city);exit;

$mem = new Memcache();

$mem-> connect('localhost', '11211');

$expires=15*60;

//check if cache exits

if(($value = $mem-> get($city)) != FALSE) {

 echo "get key from memcache: "." ";

 // $return=$mem->get($city);

 // echo json_encode($return);

}//if

else {

 $resultJson=fetch_data();

 echo count($resultJson)." ";

 if(count($resultJson)==1 || emptyempty($resultJson)){

 //从mysql中取值

 echo "get key from mysql:"." ";

 $query="select * from pm25";

 $result=mysql_query ($query) ;

 while ($row = mysql_fetch_assoc($result)){

 $rows[]=$row;

 }

 //将获取的值数组存入memcache

 for($i=0;$i<count($rows);$i++){

 $k[$i]=$rows[$i]['city'];

 $v[$i]['city']=$rows[$i]['city'];

 $v[$i]['pm25']=$rows[$i]['pm25'];

 $mem -> set($k[$i], $v[$i], false, $expires);

 }

 // $return=$mem->get($city);

 // echo json_encode($return);

 }//if

 else{

 echo "get key from new_writed mysql:"." ";

 write_db($resultJson);

 $query="select * from pm25";

 $result=mysql_query ($query) ;

 while ($row = mysql_fetch_assoc($result)){

 $rows[]=$row;

 }

 //write memcache

 for($i=0;$i<count($rows);$i++){

 $k[$i]=$rows[$i]['city'];

 $v[$i]['city']=$rows[$i]['city'];

 $v[$i]['pm25']=$rows[$i]['pm25'];

 $mem -> set($k[$i], $v[$i], false, $expires);

 }

 // $return=$mem->get($city);

 // echo json_encode($return);

 }//else

}//else

foreach ($city as $k=>$v){

 $return[$k]=$mem->get($v);

}

echo json_encode($return);

function fetch_data() {

 $url="http://www.example.com";

 //$url="";

 $data = http_get($url);

 $getJson = json_decode($data, true);

 return $getJson;

} //func fetch_data

function write_db($getJson){

 $sql="DELETE FROM pm25";

 mysql_query($sql);

 //sort the json.txt

 foreach ($getJson as $key => $row) {

 $area[$key] = $row['area'];

 $pm2_5[$key]= $row['pm2_5'];

 }

 array_multisort($area, SORT_ASC,$pm2_5,SORT_ASC,$getJson);

 for($i=0;$i<count($getJson)-1;$i++){

 if($getJson[$i]['pm2_5']==0)

 $count=0;

 else

 $count=1;

 $sum=$getJson[$i]['pm2_5'];

 for($j=$i+1;$j<count($getJson);$j++,$i++){

 if(strcmp($getJson[$j]['area'],$getJson[$i]['area'])==0 ){

 if($getJson[$j]['pm2_5']==0 ){

 continue;

 }

 else{

 $count++;

 $sum+=$getJson[$j]['pm2_5'];

 $pm2_5=$sum/$count;

 }

 }

 else{

 //insert into mysql

 $result['city']=$getJson[$i]['area'];

 $result['pm25']=intval($pm2_5);

 $query="insert into pm25(city,pm25) values ('".$result['city']."',".$result['pm25'].")";

 mysql_query($query);

 break;

 }

 }

 }

 return $getJson;

}//func write_db

$mem -> close();

?>