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")."<br/>";
$memcache->delete("name1");
echo"name1:".$memcache->get("name1")."<br/>";

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

$result_get = $memcache->get($array_get);
foreach ($result_get as $key => $value) {
echo"$key:--->$value<br/>";
}
foreach ($memcache->getStats() as $key => $value) {
echo"$key:--->$value<br/>";
};

echo"<br/>";

foreach($memcache->getExtendedStats() as $key => $value) {
echo"$key:--->$value<br/>";
}
$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: "."<br />";
	// 	$return=$mem->get($city);
	// 	echo json_encode($return);
}//if
else {
	$resultJson=fetch_data();
	echo count($resultJson)."<br />";
	if(count($resultJson)==1 || empty($resultJson)){
		//从mysql中取值
		echo "get key from mysql:"."<br />";
		$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:"."<br />";
		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();
?>

以上所述就是本文的全部内容了，希望大家能够喜欢。