【php】キャッシュクラスの作成:ファイルキャッシュとmemcacheキャッシュをサポート

<?php
//      ：  mysqli                    
abstract class Abstract_Cache {
	protected $cache_time;
	public function set_cache_time($cache_time) {
		$this->cache_time    = $cache_time;//      ，           
	}
	abstract function &get($key);
	abstract function set($key, $data);
	abstract function add($key, $data);
	abstract function del($key);
	abstract function get_key($key);
	abstract function flush();
}

class cache_file extends Abstract_Cache {
	private $cache_dir;
	public function set_cache_dir($cache_dir = './cache/') {
		$this->cache_dir    = $cache_dir;
	}
	public function mkpath($dir) {
                //       
                return is_dir($dir) or ($this->mkpath(dirname($dir)) and (mkdir($dir, 0777) and chmod($dir,0777)));
	}
	public function &get($key, $cache_time = '') {
		if(empty ($cache_time)) {
			$cache_time	= $this->cache_time;
		} else {
			$cache_time	= intval($cache_time);
		}
		$cache_encode_key  = $this->get_key($key);
                //       
                $filename = $this->cache_dir.'/'.substr($cache_encode_key,0,2).'/'.substr($cache_encode_key,2,2).'/'.$cache_encode_key.".cache.php";
		//             
                if(!is_file($filename) || time() - filemtime($filename) > $cache_time) {
			return false;
		} else {
			return unserialize(file_get_contents($filename));//                 ，             
		}
	}
	public function set($key,$data) {
		$cache_encode_key  = $this->get_key($key);
		$cache_dir	= $this->cache_dir.'/'.substr($cache_encode_key,0,2).'/'.substr($cache_encode_key,2,2).'/';
		$filename	= $cache_dir.$cache_encode_key.".cache.php";
		if( $this->mkpath($cache_dir) ) {
			$out    = serialize($data);
			file_put_contents($filename, $out);
		}
	}
	public function add($key, $data) {
		$cache_encode_key	= $this->get_key($key);
		$cache_dir	= $this->cache_dir.'/'.substr($cache_encode_key,0,2).'/'.substr($cache_encode_key,2,2).'/';
		$filename	= $cache_dir.$cache_encode_key.".cache.php";
		if(is_file($filename)) {
			return false;
		} else {
			$this->set($key, $data);
		}
	}
	public function del($key) {
		$cache_encode_key	= $this->get_key($key);
		$cache_dir	= $this->cache_dir.'/'.substr($cache_encode_key,0,2).'/'.substr($cache_encode_key,2,2).'/';
		$filename	= $cache_dir.$cache_encode_key.".cache.php";
		if(is_file($filename)) {
			return false;
		} else {
			@unlink($filename);
		}
	}
	public function flush() {
		$this->remove_dir($this->cache_dir,false);
	}
	public function get_key($key){
		Return md5(CACHE_KEY.$key);
	}
	private function remove_file($dir) {
		if (is_dir($dir)) {
			$dh = opendir($dir);
			while (false !== ($file = readdir($dh))) {
				if($file!="." && $file!="..") {
					$fullpath=$dir."/".$file;
					if(!is_dir($fullpath)) {
						@unlink($fullpath);
					} else {
						$this->remove_dir($fullpath);
					}
				}
			}
			closedir($dh);
		}
	}
	private function remove_dir($dir, $self = true) {
		$this->remove_file($dir);
		if ($self == true && is_dir($dir)) {
			rmdir($dir);
		}
	}
}

class cache_memcache extends Abstract_Cache {
    var $_memcache = null;
    /**
     *            
     *
     *    @author    
     *    @param     array $options
     *    @return    bool
     */
    function __construct($memcache_conf)
    {
        $this->_memcache = new Memcache;
        return $this->_memcache->connect($memcache_conf['host'], $memcache_conf['port']);
    }

    /**
     *        
     *
     *    @author    
     *    @param    none
     *    @return    void
     */
    function set($key, $value, $ttl = null)
    {
		$cache_encode_key = $this->get_key($key);
        return $this->_memcache->set($cache_encode_key, $value, $ttl);
    }

    /**
     *        
     *
     *    @author    
     *    @param     string $key
     *    @return    mixed
     */
    function &get($key)
    {
		$cache_encode_key = $this->get_key($key);
        return $this->_memcache->get($cache_encode_key);
    }

    /**
     *        
     *
     *    @author    
     *    @param    none
     *    @return    void
     */
    function add($key, $value, $ttl = null)
    {
		$cache_encode_key = $this->get_key($key);
        return $this->_memcache->add($cache_encode_key, $value, $ttl);
    }

    /**
     *        
     *
     *    @author    
     *    @return    bool
     */
    function flush()
    {
        return $this->_memcache->flush();
    }

    function del($key)
    {
		$cache_encode_key = $this->get_key($key);
        return $this->_memcache->delete($key);
    }

	public function get_key($key)
	{
		$cache_encode_key = $this->get_key($key);
		Return md5(CACHE_KEY.$key);
	}
}