php中memcache 基本操作实例

$memcache->add("name1","user_name1",MEMCACHE_COMPRESSED,0);
$memcache->add("name2","user_name2",0);
$array1 = array('name1' => 'jiajiam1','age1'=>12,'country'=>'china');
$memcache->add("other",$array1,20);
$memcache->set("name3","user_name3",0);
$memcache->replace("name1","user_name_relpace",0);
$memcache->replace("123","12345");

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

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

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

echo"
";

foreach($memcache->getExtendedStats() as $key => $value) {
echo"$key:--->$value
";
}
$memcache->close();
?>

//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: "."
";
// $return=$mem->get($city);
// echo json_encode($return);
}//if
else {
$resultJson=fetch_data();
echo count($resultJson)."
";
if(count($resultJson)==1 || empty($resultJson)){
//从mysql中取值
echo "get key from mysql:"."
";
$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:"."
";
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[$i],$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,$pm2_5,$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();
?>