Discuz X memcached机制分析

function init() {

        if(!$this-&gt;initated) {

            $this-&gt;_init_db();

            $this-&gt;_init_memory(); //今天我们关注这个，内存方法。

            $this-&gt;_init_user();

            $this-&gt;_init_session();

            $this-&gt;_init_setting();

            $this-&gt;_init_cron();

            $this-&gt;_init_misc();

        }

        $this-&gt;initated = true;

    }

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function init() {

if(!$this->initated) {

$this->_init_db();

$this->_init_memory(); //今天我们关注这个，内存方法。

$this->_init_user();

$this->_init_session();

$this->_init_setting();

$this->_init_cron();

$this->_init_misc();

}

$this->initated = true;

}

function _init_memory() {
        $this-&gt;mem = new discuz_memory(); //新建discuz_memory实例
        if($this-&gt;init_memory) {
            $this-&gt;mem-&gt;init($this-&gt;config['memory']); //注意，init是discuz_memory的方法哦
        }
        $this-&gt;var['memory'] = $this-&gt;mem-&gt;type;
    }

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function _init_memory() {

$this->mem = new discuz_memory(); //新建discuz_memory实例

if($this->init_memory) {

$this->mem->init($this->config['memory']); //注意，init是discuz_memory的方法哦

}

$this->var['memory'] = $this->mem->type;

}

//构造函数
    function discuz_memory() {
        $this-&gt;extension['eaccelerator'] = function_exists('eaccelerator_get');
        $this-&gt;extension['xcache'] = function_exists('xcache_get');
        $this-&gt;extension['memcache'] = extension_loaded('memcache'); //检查memcache扩展是否加载，返回bool
    }

//_init_memory() 中，实例也调用了init()

function init($config) {

        $this-&gt;config = $config; //这里的$config能追溯到discuz_core的构造函数，就是把config_global.php的数据加载进来
        $this-&gt;prefix = empty($config['prefix']) ? substr(md5($_SERVER['HTTP_HOST']), 0, 6).'_' : $config['prefix'];
        $this-&gt;keys = array();

        // memcache 接口，判断是否有mem扩展，并且config中是否设置了服务器地址
        if($this-&gt;extension['memcache'] &amp;&amp; !empty($config['memcache']['server'])) {
            require_once libfile('class/memcache');
            $this-&gt;memory = new discuz_memcache();
            $this-&gt;memory-&gt;init($this-&gt;config['memcache']); //这里的init()是discuz_memcache的方法哦，要和之前的区分。
            if(!$this-&gt;memory-&gt;enable) { //检测是否能连接上memcached服务
                $this-&gt;memory = null;
            }
        }

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//构造函数

function discuz_memory() {

$this->extension['eaccelerator'] = function_exists('eaccelerator_get');

$this->extension['xcache'] = function_exists('xcache_get');

$this->extension['memcache'] = extension_loaded('memcache'); //检查memcache扩展是否加载，返回bool

}

//_init_memory() 中，实例也调用了init()

function init($config) {

$this->config = $config; //这里的$config能追溯到discuz_core的构造函数，就是把config_global.php的数据加载进来

$this->prefix = empty($config['prefix']) ? substr(md5($_SERVER['HTTP_HOST']), 0, 6).'_' : $config['prefix'];

$this->keys = array();

// memcache 接口，判断是否有mem扩展，并且config中是否设置了服务器地址

if($this->extension['memcache'] && !empty($config['memcache']['server'])) {

require_once libfile('class/memcache');

$this->memory = new discuz_memcache();

$this->memory->init($this->config['memcache']); //这里的init()是discuz_memcache的方法哦，要和之前的区分。

if(!$this->memory->enable) { //检测是否能连接上memcached服务

$this->memory = null;

}

class phpig_memcache
{
    var $enable;
    var $obj;

    function phpig_memcache() {

    }
//连接memcached服务，返回bool
    function init($config) {
        if(!empty($config['server'])) {
            $this-&gt;obj = new Memcache;
            if($config['pconnect']) {
                $connect = @$this-&gt;obj-&gt;pconnect($config['server'], $config['port']);
            } else {
                $connect = @$this-&gt;obj-&gt;connect($config['server'], $config['port']);
            }
            $this-&gt;enable = $connect ? true : false;
        }
    }

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class phpig_memcache

{

var $enable;

var $obj;

function phpig_memcache() {

}

//连接memcached服务，返回bool

function init($config) {

if(!empty($config['server'])) {

$this->obj = new Memcache;

if($config['pconnect']) {

$connect = @$this->obj->pconnect($config['server'], $config['port']);

} else {

$connect = @$this->obj->connect($config['server'], $config['port']);

}

$this->enable = $connect ? true : false;

}

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