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php中memcache 基本操作实例

May 26, 2016 am 08:18 AM

memcache php 작동하다

本文实例讲述了PHP中Memcache的基本操作及用法。分享给大家供大家参考。有需要的小伙伴快来研究下吧。

php中memcache 基本操作实例

&lt;!DOCTYPE html&gt;
&lt;html&gt;
&lt;head&gt;
&lt;title&gt;memcache demo&lt;/title&gt;
&lt;meta http-equiv=&quot;content-type&quot;content=&quot;text/html;chatset=utf-8&quot;&gt;
&lt;/head&gt;
&lt;body&gt;
&lt;?php
$server_ip = &#39;127.0.0.1&#39;;
$server_port = 11211;

$memcache = new Memcache();
$memcache-&gt;connect($server_ip,$server_port);

$memcache-&gt;add(&quot;name1&quot;,&quot;user_name1&quot;,MEMCACHE_COMPRESSED,0);
$memcache-&gt;add(&quot;name2&quot;,&quot;user_name2&quot;,MEMCACHE_COMPRESSED,0);
$array1 = array(&#39;name1&#39; =&gt; &#39;jiajiam1&#39;, 
&#39;age1&#39;=&gt;12,
&#39;country&#39;=&gt;&#39;china&#39;);
$memcache-&gt;add(&quot;other&quot;,$array1,MEMCACHE_COMPRESSED,20);
$memcache-&gt;set(&quot;name3&quot;,&quot;user_name3&quot;,MEMCACHE_COMPRESSED,0);
$memcache-&gt;replace(&quot;name1&quot;,&quot;user_name_relpace&quot;,MEMCACHE_COMPRESSED,0);
$memcache-&gt;replace(&quot;123&quot;,&quot;12345&quot;);

echo&quot;name1:&quot;.$memcache-&gt;get(&quot;name1&quot;).&quot;&lt;br/&gt;&quot;;
$memcache-&gt;delete(&quot;name1&quot;);
echo&quot;name1:&quot;.$memcache-&gt;get(&quot;name1&quot;).&quot;&lt;br/&gt;&quot;;

$array_get = array(&quot;name1&quot;,&quot;name2&quot;,&quot;name3&quot;);

$result_get = $memcache-&gt;get($array_get);
foreach ($result_get as $key =&gt; $value) {
echo&quot;$key:---&gt;$value&lt;br/&gt;&quot;;
}
foreach ($memcache-&gt;getStats() as $key =&gt; $value) {
echo&quot;$key:---&gt;$value&lt;br/&gt;&quot;;
};

echo&quot;&lt;br/&gt;&quot;;

foreach($memcache-&gt;getExtendedStats() as $key =&gt; $value) {
echo&quot;$key:---&gt;$value&lt;br/&gt;&quot;;
}
$memcache-&gt;close();
?&gt;
&lt;/body&gt;
&lt;/html&gt;

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我们再来看个更加具体些的实例

&lt;?php
include(&#39;inc/common.inc.php&#39;);

if (! isset($city) || ! is_array($city) ) {
	exit;
}

//print_r ($city);exit;

$mem = new Memcache();
$mem-&gt; connect(&#39;localhost&#39;, &#39;11211&#39;);
$expires=15*60;

//check if cache exits
if(($value = $mem-&gt; get($city)) != FALSE) {
	echo &quot;get key from memcache: &quot;.&quot;&lt;br /&gt;&quot;;
	// 	$return=$mem-&gt;get($city);
	// 	echo json_encode($return);
}//if
else {
	$resultJson=fetch_data();
	echo count($resultJson).&quot;&lt;br /&gt;&quot;;
	if(count($resultJson)==1 || empty($resultJson)){
		//从mysql中取值
		echo &quot;get key from mysql:&quot;.&quot;&lt;br /&gt;&quot;;
		$query=&quot;select * from pm25&quot;;
		$result=mysql_query ($query) ;
		while ($row = mysql_fetch_assoc($result)){
			$rows[]=$row;
		}
		//将获取的值数组存入memcache
		for($i=0;$i&lt;count($rows);$i++){
			$k[$i]=$rows[$i][&#39;city&#39;];
			$v[$i][&#39;city&#39;]=$rows[$i][&#39;city&#39;];
			$v[$i][&#39;pm25&#39;]=$rows[$i][&#39;pm25&#39;];
			$mem -&gt; set($k[$i], $v[$i], false, $expires);
		}
		// 		$return=$mem-&gt;get($city);
		// 		echo json_encode($return);
	}//if
	else{
		echo &quot;get key from new_writed mysql:&quot;.&quot;&lt;br /&gt;&quot;;
		write_db($resultJson);
		$query=&quot;select * from pm25&quot;;
		$result=mysql_query ($query) ;
		while ($row = mysql_fetch_assoc($result)){
			$rows[]=$row;
		}
		//write memcache
		for($i=0;$i&lt;count($rows);$i++){
			$k[$i]=$rows[$i][&#39;city&#39;];
			$v[$i][&#39;city&#39;]=$rows[$i][&#39;city&#39;];
			$v[$i][&#39;pm25&#39;]=$rows[$i][&#39;pm25&#39;];
			$mem -&gt; set($k[$i], $v[$i], false, $expires);
		}
		// 		$return=$mem-&gt;get($city);
		// 		echo json_encode($return);
	}//else

}//else

foreach ($city as $k=&gt;$v){
	$return[$k]=$mem-&gt;get($v);
}
echo json_encode($return);

function fetch_data() {
	$url=&quot;http://www.example.com&quot;;
	//$url=&quot;&quot;;	
	$data = http_get($url);
	$getJson = json_decode($data, true);
	return $getJson;
} //func fetch_data

function write_db($getJson){
	$sql=&quot;DELETE FROM pm25&quot;;
	mysql_query($sql);
	//sort the json.txt
	foreach ($getJson as $key =&gt; $row) {
		$area[$key] = $row[&#39;area&#39;];
		$pm2_5[$key]= $row[&#39;pm2_5&#39;];
	}
	array_multisort($area, SORT_ASC,$pm2_5,SORT_ASC,$getJson);
	for($i=0;$i&lt;count($getJson)-1;$i++){
		if($getJson[$i][&#39;pm2_5&#39;]==0)
			$count=0;
		else
			$count=1;
		$sum=$getJson[$i][&#39;pm2_5&#39;];
		for($j=$i+1;$j&lt;count($getJson);$j++,$i++){
			if(strcmp($getJson[$j][&#39;area&#39;],$getJson[$i][&#39;area&#39;])==0 ){
				if($getJson[$j][&#39;pm2_5&#39;]==0 ){
					continue;
				}
				else{
					$count++;
					$sum+=$getJson[$j][&#39;pm2_5&#39;];
					$pm2_5=$sum/$count;
				}
			}
			else{
				//insert into mysql
				$result[&#39;city&#39;]=$getJson[$i][&#39;area&#39;];
				$result[&#39;pm25&#39;]=intval($pm2_5);
				$query=&quot;insert into pm25(city,pm25) values (&#39;&quot;.$result[&#39;city&#39;].&quot;&#39;,&quot;.$result[&#39;pm25&#39;].&quot;)&quot;;
				mysql_query($query);
				break;
			}
		}
	}
	return $getJson;
}//func write_db


$mem -&gt; close();
?&gt;

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