本文實例講述了PHP中Memcache的基本操作及用法。分享給大家供大家參考。有需要的小伙伴快來研究下吧。
php中memcache 基本操作實例
?
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 <!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/>"; } $memcache->close(); ?> </body> </html>我們再來看個更加具體些的實例
?
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 <?php include('inc/common.inc.php'); if (! isset($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)){ //從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; } //將獲取的值數組存入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內容了，希望大家能夠喜歡。
