A cache interface demo written in PHP, compatible with redis and memcache

 /**
 * Factory method pattern
 * -------------
 * @author zhangqian
 * @version v1.0
*/
 //Cache interface
 interface cache {
 public function init($conf);
 public function setVal($key , $ val);
 public function getVal($key);
 public function delVal($key);
 public function autoIncreament($key);
 }
 //mem
 class mymemCache implements cache {
 //mymem connection
 public function init($conf)
 {
 echo 'initialize mymem';
 }
 public function setVal($key , $val)
 {
 echo 'mem set value';
 }
 public function getVal($key)
 {
 echo 'mem get value';
 }
 public function delVal($key)
 {
 echo 'mem delete value';
 }
 public function autoIncreament($key)
 {
 echo 'mem auto-increment';
 }
 }
 //redis
 class redisCache implements cache {
 //redis connection
 public function init($arr)
 {
 echo 'Initialize redis';
 }
 public function setVal($key, $val)
 {
 echo 'redis set value';
 }
 public function getVal($key)
 {
 echo 'redis get value';
 }
 public function delVal($key)
 {
 echo 'redis delete value';
 }
 public function autoIncreament($key)
 {
 echo 'redis auto-increment';
 }
 }
 class cacheFactory
 {
 private static $obj;
 private static $type;
 private static $conf;
 private static $allowtype = array ('mymem','redis');
 private static function getConfig()
 {
 //include_once('config.php');Load the configuration file to obtain the cache type and cache configuration parameters
 global $_SC;
 self ::$type = $_SC['cachetype'];//Judgment of short value
 self::$conf = $_SC['cacheconf'];//Judgment of short value
 }
 //External call to create cache object
 public static function CreateOperation(){
 self::getConfig();
 try
 {
 $error = 'Unknown cache type';
 if(in_array(self::$type , self::$allowtype))
 {
 $type = self::$type.'Cache';
 self::$obj = new $type;
 self::$obj->init(self::$conf);//Connect
 }
 else
 throw new Exception($error);
 }
 catch (Exception $e) {
 echo 'Caught exception: ', $e->getMessage(), "n";
 exit;
 }
 return self: :$obj;
 }
 }
 $_SC = array();
 $_SC['cachetype'] = 'redis';//mymem
 $_SC['cacheconf'] = array();

 $cache = cacheFactory::CreateOperation();
 $cache->setVal('a',1);
 echo '';
 $a = $cache-> ;getVal('a');
 echo '';
 $cache->delVal('a');
 ?>