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
<?phpinclude("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 exitsif(($value = $mem-> get($city)) != FALSE) {echo "get key from memcache: "."<br />";// $return=$mem->get($city);// echo json_encode($return);}//ifelse {$resultJson=fetch_data();echo count($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[]=$row;}//将获取的值数组存入memcachefor($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);}//ifelse{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 memcachefor($i=0;$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}//elseforeach ($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 $getJson;} //func fetch_datafunction write_db($getJson){$sql="DELETE FROM pm25";mysql_query($sql);//sort the json.txtforeach ($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。