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上一篇PHP 中使用 Memcached 作缓存（3）- 使用 memcached扩展 byKey系列方法讲了 PHP memcached 扩展的基本用法，这一篇我们将以下举例说明以下 byKey 系列函数的用法。
byKey 系列函数主要是为了解决在多台服务器的情况下，将一些值存取指定服务器的问题。

<?php

$oMemCached = new \Memcached();
$oMemCached->addServer('127.0.0.1', 11211, 10);
$oMemCached->addServer('127.0.0.1', 11212, 10);
$oMemCached->addServer('127.0.0.1', 11213, 10);

print_r($oMemCached->getVersion());

print_r($oMemCached->getServerList());

print_r($oMemCached->getServerByKey('tpl'));
print_r($oMemCached->getServerByKey('config'));
print_r($oMemCached->getServerByKey('sql'));
print_r($oMemCached->getServerByKey('zpz'));

$oMemCached->setByKey('zpz', 'name', 'zpz');
$oMemCached->setByKey('zpz', 'age', '1000');
$oMemCached->setByKey('zpz', 'male', 'yes');

echo 'name    : ', $oMemCached->getByKey('zpz', 'name'), "\n";
echo 'age     : ', $oMemCached->getByKey('zpz', 'age'), "\n";
echo 'male    : ', $oMemCached->getByKey('zpz', 'male'), "\n";

$oMemCached->setByKey('tpl', 'index', 'index.tpl.php');
$oMemCached->setByKey('tpl', 'head', 'head.tpl.php');
$oMemCached->setByKey('tpl', 'foot', 'foot.tpl.php');

$oMemCached->getDelayedByKey('tpl', array('index', 'head', 'foot'), false, function(){
	print_r(func_get_args());
});

输出：

Array
(
    [127.0.0.1:11211] => 1.4.14
    [127.0.0.1:11212] => 1.4.14
    [127.0.0.1:11213] => 1.4.14
)
Array
(
    [0] => Array
        (
            [host] => 127.0.0.1
            [port] => 11211
            [weight] => 10
        )

    [1] => Array
        (
            [host] => 127.0.0.1
            [port] => 11212
            [weight] => 10
        )

    [2] => Array
        (
            [host] => 127.0.0.1
            [port] => 11213
            [weight] => 10
        )

)
Array
(
    [host] => 127.0.0.1
    [port] => 11211
    [weight] => 10
)
Array
(
    [host] => 127.0.0.1
    [port] => 11212
    [weight] => 10
)
Array
(
    [host] => 127.0.0.1
    [port] => 11211
    [weight] => 10
)
Array
(
    [host] => 127.0.0.1
    [port] => 11213
    [weight] => 10
)
name    : zpz
age     : 1000
male    : yes
Array
(
    [0] => Memcached Object
        (
        )

    [1] => Array
        (
            [key] => index
            [value] => index.tpl.php
        )

)
Array
(
    [0] => Memcached Object
        (
        )

    [1] => Array
        (
            [key] => head
            [value] => head.tpl.php
        )

)
Array
(
    [0] => Memcached Object
        (
        )

    [1] => Array
        (
            [key] => foot
            [value] => foot.tpl.php
        )

)