Cache_memcached iis_supported() 方法返回false
代码如下,为什么memcached和memcache 都不支持扩展了
难道哪里少步骤了
class CI_Cache_memcached extends CI_Driver {
private $_memcached; // Holds the memcached object
protected $_memcache_conf = array(
'default' => array(
'default_host' => '127.0.0.1',
'default_port' => 11211,
'default_weight' => 1
)
);
// ------------------------------------------------------------------------
/**
* Fetch from cache
*
* @param mixed unique key id
* @return mixed data on success/false on failure
*/
public function get($id)
{
$data = $this->_memcached->get($id);
return (is_array($data)) ? $data : FALSE;
//return empty($data) ? FALSE : $data;
}
// ------------------------------------------------------------------------
/**
* Save
*
* @param string unique identifier
* @param mixed data being cached
* @param int time to live
* @return boolean true on success, false on failure
*/
public function save($id, $data, $ttl = 60)
{
if (get_class($this->_memcached) == 'Memcached')
{
return $this->_memcached->set($id, array($data, time(), $ttl), $ttl);
}
else if (get_class($this->_memcached) == 'Memcache')
{
return $this->_memcached->set($id, array($data, time(), $ttl), 0, $ttl);
}
return FALSE;
}
// ------------------------------------------------------------------------
/**
* Delete from Cache
*
* @param mixed key to be deleted.
* @return boolean true on success, false on failure
*/
public function delete($id)
{
return $this->_memcached->delete($id);
}
// ------------------------------------------------------------------------
/**
* Clean the Cache
*
* @return boolean false on failure/true on success
*/
public function clean()
{
return $this->_memcached->flush();
}
// ------------------------------------------------------------------------
/**
* Cache Info
*
* @param null type not supported in memcached
* @return mixed array on success, false on failure
*/
public function cache_info($type = NULL)
{
return $this->_memcached->getStats();
}
// ------------------------------------------------------------------------
/**
* Get Cache Metadata
*
* @param mixed key to get cache metadata on
* @return mixed FALSE on failure, array on success.
*/
public function get_metadata($id)
{
$stored = $this->_memcached->get($id);
if (count($stored) !== 3)
{
return FALSE;
}
list($data, $time, $ttl) = $stored;
return array(
'expire' => $time + $ttl,
'mtime' => $time,
'data' => $data
);
}
// ------------------------------------------------------------------------
/**
* Setup memcached.
*/
private function _setup_memcached(){
// Try to load memcached server info from the config file.
$CI =& get_instance();
if ($CI->config->load('memcached', TRUE, TRUE)){
if (is_array($CI->config->config['memcached']))
{
$this->_memcache_conf = NULL;
foreach ($CI->config->config['memcached'] as $name => $conf)
{
$this->_memcache_conf[$name] = $conf;
}
}
}
//$this->_memcached = new Memcached();// compatibility memcached memcache
if (extension_loaded('memcached')){
$this->_memcached = new Memcached();
}else{
$this->_memcached = new Memcache();
}
foreach ($this->_memcache_conf as $name => $cache_server)
{
if ( ! array_key_exists('hostname', $cache_server))
{
//$cache_server['hostname'] = $this->_default_options['default_host'];//no _default_options
$cache_server['hostname'] = $this->_memcache_conf['default']['default_host'];
}
if ( ! array_key_exists('port', $cache_server))
{
$cache_server['port'] = $this->_memcache_conf['default']['default_port'];//no _default_options
}
if ( ! array_key_exists('weight', $cache_server))
{
$cache_server['weight'] = $this->_memcache_conf['default']['default_weight'];//no _default_options
}
// $this->_memcached->addServer(
// $cache_server['hostname'], $cache_server['port'], $cache_server['weight']
// );
if (extension_loaded('memcached')){
$this->_memcached->addServer(
$cache_server['hostname'], $cache_server['port'], $cache_server['weight']
);
}else{
$this->_memcached->addServer($cache_server['hostname'],$cache_server['port'],TRUE,$cache_server['weight']);
}
/* else{
$this->_memcached->addServer($cache_server['hostname'],$cache_server['port'],TRUE, $cache_server['weight']);
} */
}
}
// ------------------------------------------------------------------------
/**
* Is supported
*
* Returns FALSE if memcached is not supported on the system.
* If it is, we setup the memcached object & return TRUE
*/
public function is_supported(){
if (!extension_loaded('memcached')&&!extension_loaded('memcache'))//if ( ! extension_loaded('memcached'))
{
log_message('error', 'The Memcached Extension must be loaded to use Memcached Cache.');
return FALSE;
}
$this->_setup_memcached();
return TRUE;
}
// ------------------------------------------------------------------------
}
// End Class
/* End of file Cache_memcached.php */
/* Location: ./system/libraries/Cache/drivers/Cache_memcached.php */
is_supported()
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