PHP memory cache Memcached class example, phpmemcached_PHP tutorial

class MemcacheModel {
private $mc = null;
/**
* Construction method, used to add servers and create memcahced objects
*/
function __construct(){
$params = func_get_args();
$mc = new Memcache;
//If there are multiple memcache servers
if( count($params) > 1){
foreach ($params as $v){
call_user_func_array(array($mc, 'addServer'), $v);
}
//If there is only one memcache server
} else {
call_user_func_array(array($mc, 'addServer'), $params[0]);
}
$this->mc=$mc;
}
/**
* Get memcached object
* @return object memcached object
*/
function getMem(){
return $this->mc;
}
/**
* Check if mem is connected successfully
* @return bool Returns true if the connection is successful, otherwise returns false
*/
function mem_connect_error(){
$stats=$this->mc->getStats();
if(emptyempty($stats)){
return false;
}else{
return true;
}
}

private function addKey($tabName, $key){
$keys=$this->mc->get($tabName);
if(emptyempty($keys)){
$keys=array();
}
//If the key does not exist, add one
if(!in_array($key, $keys)) {
$keys[]=$key; //Add new keys to the keys of this table
$this->mc->set($tabName, $keys, MEMCACHE_COMPRESSED, 0);
return true; // does not exist return true
}else{
return false; //Exists return false
}
}
/**
* Add data to memcache
* @param string $tabName The name of the data table that needs to be cached
* @param string $sql Use sql as the key of memcache
* @param mixed $data Data to be cached
*/
function addCache($tabName, $sql, $data){
$key=md5($sql);
//If it does not exist
if($this->addKey($tabName, $key)){
$this->mc->set($key, $data, MEMCACHE_COMPRESSED, 0);
}
}
/**
* Get the data saved in memcahce
* @param string $sql Use SQL key
* @return mixed returns the data in the cache
*/
function getCache($sql){
$key=md5($sql);
return $this->mc->get($key);
}

/**
* Delete all caches related to the same table
* @param string $tabName The table name of the data table
*/
function delCache($tabName){
$keys=$this->mc->get($tabName);
//Delete all caches of the same table
if(!emptyempty($keys)){
foreach($keys as $key){
$this->mc->delete($key, 0); //0 means delete immediately
}
}
//Delete all sql keys of the table
$this->mc->delete($tabName, 0);
}
/**
* Delete the cache of a single statement
* @param string $sql SQL statement executed
*/
function delone($sql){
$key=md5($sql);
$this->mc->delete($key, 0); //0 means delete immediately
}
}
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