[root@localhost memcached]# pecl install memcache

[root@localhost memcached]# ls /usr/lib/php/modules/

[root@localhost memcached]# ls /etc/php.d/

[root@localhost memcached]# vi /etc/php.d/memcache.ini
; Enable memcache extension module
extension=memcache.so

[root@localhost memcached]# /etc/init.d/httpd restart
httpd を停止中: [ OK ]
httpd を起動中: [ OK ]

★テストphp

<?php

$memcache = new Memcache;
$memcache->connect('localhost', 11211) or die ("Could not connect");

$version = $memcache->getVersion();
echo "Server's version: ".$version."<br/>\n";

$tmp_object = new stdClass;
$tmp_object->str_attr = 'test';
$tmp_object->int_attr = 123;

$memcache->set('key', $tmp_object, false, 10) or die ("Failed to save data at the server");

echo "Store data in the cache (data will expire in 10 seconds)<br/>\n";

$get_result = $memcache->get('key');
echo "Data from the cache:<br/>\n";

var_dump($get_result);
?>