PHP CodeIgniter - 使用 Memcached

官方文件寫得很簡單，簡單的無法看懂:

@ https://ellislab.com/codeigniter/user-guide/libraries/caching.html
$this->load->driver('cache');
$this->cache->memcached->save('foo', 'bar', 10);

後來我自己去 trace 原始碼才知道該怎樣設定跟測試。首先，新增一個設定檔：

$ vim application/config/memcached.php
$config['memcached'] = array(
        'hostname' => 'Your_memecached_cluster',
        'port' => 11211,
        'weight' => 1
);

接著，使用：

class My_Library {
public function __construct() {
$this->ci =& get_instance();
$this->init();
}
public function init() {
$this->ci->load->driver('cache');
return $this->ci->cache->is_supported('memcached');
}
public function set($key, $value, $tts) {
return $this->ci->cache->memcached->save($key, $value, $tts);
}
public function delete($key) {
$this->ci->cache->memcached->delete($key);
}
}

關鍵之處就是要呼叫 $this->ci->cache->is_supported('memcached') 這段，才會從 application/config/memcached.php 把資訊更新進來 Orz

若需要 debug 的話:

$ find . -name "*mem*"
./system/libraries/Cache/drivers/Cache_memcached.php

找到 $this->_memcached 可以善用它，例如 $this->_memcached->getResultCode();