Home >Backend Development >PHP Tutorial >Examples of basic operations of memcache in php, basic operations of memcache_PHP tutorial

Examples of basic operations of memcache in php, basic operations of memcache_PHP tutorial

WBOY
WBOYOriginal
2016-07-13 09:53:36905browse

Basic operation examples of memcache in php, basic memcache operations

Basic operation examples of memcache in php

<!DOCTYPE html>
<html>
<head>
<title>memcache demo</title>
<meta http-equiv="content-type"content="text/html;chatset=utf-8">
</head>
<body>
<&#63;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();
&#63;>
</body>
</html>

Let’s look at a more specific example

<&#63;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();
&#63;>

The above is the entire content of this article, I hope you all like it.

www.bkjia.comtruehttp: http- equiv="content-type"content="text/...
Statement:
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn