memcache分布式小实例

<?php

/**
 * 分布式的 memcache set 实现
 */

/**
 * 创建缓存实现memcache 添加分布式服务器  并设置权限
 */

function createCache() {
    $arr = array(
        array("host" => "127.0.0.1", "port" => 11211, "weight" => 20), //127.0.0.1:11211的权重是20%
        array("host" => "127.0.0.1", "port" => 11212, "weight" => 80), //127.0.0.1:11212的权重是80%
    );
    $cache = new memcache();
    foreach ($arr as $ele) {
        //使用长连接，并且设置不同memcache服务器的权重，将memcache服务器添加到连接池
        $cache->addServer($ele["host"], $ele["port"], true, $ele["weight"]);
    }
    return $cache;
}

header("content-type:text/html;charset=utf-8");
$cache = createCache();
for ($i = 0; $i < 10; $i++) {
    //由于使用了分布式，所以这里不需要使用connect或者pconnect打开链接,
    //set方法会调用memcache的分布式缓存分配算法，按照权重将缓存项缓存到连接池的某个服务器
    if ($cache->set($i, $i, 0, 3600)) {
        echo "缓存成功,key:$i,value:$i";
    } else {
        echo "缓存失败";
    }
    echo "<br/>";
}
?>

<?php

/**
 * 分布式的 memcache get 实现
 */

function createCache() {
    $arr = array(
        array("host" => "127.0.0.1", "port" => 11211, "weight" => 20),
        array("host" => "127.0.0.1", "port" => 11212, "weight" => 80)
    );
    $cache = new memcache();
    foreach ($arr as $ele) {
        $cache->addServer($ele ["host"], $ele ["port"], true, $ele ["weight"], 1);
    }
    return $cache;
}

header('content-type:text/html;charset=utf-8');
$cache = createCache();
$val;
for ($i = 0; $i < 10; $i ++) {
    $val = $cache->get($i);
    if (false === $val) {
        echo "缓存获取失败";
    } else {
        echo "缓存获取成功:,key:$val,value:$val";
    }
    echo "<br/>";
}
$cache->close();
?>