配置多个服务器,在 Illuminate\Cache\MemcachedConnector 使用addServer 添加进 memcached 具体见文档

cat config/cache.php

'memcached' => [
            'driver' => 'memcached',
            'servers' =>
           [
                [
                    'host' => '127.0.0.1', 'port' => 11211, 'weight' => 80
                ],
                 [
                    'host' => '127.0.0.1', 'port' => 11212, 'weight' => 20
                ],
            ],

https://laravel-china.org/top...

public function connect(array $servers)
{
    $memcached = $this->getMemcached();
    // For each server in the array, we'll just extract the configuration and add
    // the server to the Memcached connection. Once we have added all of these
    // servers we'll verify the connection is successful and return it back.
    foreach ($servers as $server) {
        $memcached->addServer(
            $server['host'], $server['port'], $server['weight']
        );
    }
    $memcachedStatus = $memcached->getVersion();
    //Where a connection has failed to a server the version is returned as '255.255.255'.
    array:2 [▼
  "xxx:11211" => "1.5.5"
  "xxx:11222" => "1.5.5"
]
    if (! is_array($memcachedStatus)) {
        throw new RuntimeException('No Memcached servers added.');
    }
    if (in_array('255.255.255', $memcachedStatus) && count(array_unique($memcachedStatus)) === 1) {
        throw new RuntimeException('Could not establish Memcached connection.');
    }
    return $memcached;
}

cat Illuminate\Cache\Repository.php

public function get($key, $default = null)
    {
    //$this->store 来自Illuminate\Cache\MemcachedStore 
  dump($this->store->getmemcached()->getstats());//返回config/cache.php memcached servers数组服务器信息  
        $value = $this->store->get($key);

        if (is_null($value))
        {
            $this->fireCacheEvent('missed', [$key]);

            $value = value($default);
        }
        else
        {
            $this->fireCacheEvent('hit', [$key, $value]);
        }

        return $value;
    }

cat bootstarp/app.php
$app['events']->listen('cache.write',function($key, $value, $time) use ($app){
    dump(app('cache')->store(),app('cache.store')->getStore()->getMemcached()->getstats());
});

测试

echo \Cache::get('test');// 调用函数里 $this->store->getmemcached()->getstats() 输出的还是2个服务器信息 ["127.0.0.1:11221" => [],"127.0.0.1:11222" => [],]，怎么知道获取 test 缓存的时候具体连接的哪个服务器呢?