php中memcache 基本操作实例

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。

php中memcache 基本操作实例

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