public function write(array $keys, $expiry = null) {
		foreach ($keys as $key => &$value) {
			$this->_cache[$key] = $value;
		}
		return true;
	}
public function write(array $keys, $expiry = null) {
		foreach ($keys as $key => &$value) {
			$this->_cache[$key] = $value;
		}
		return true;
	}
public function write ( array $ keys , $ expiry = null ) { foreach ( $ keys as $ key => & $ value ) { $ this -> _cache [ $ key ] = $ value ; } return true ; }
Write values to the cache.

@param array $keys Key/value pairs with keys to uniquely identify the to-be-cached item.
@param mixed $data The value to be cached.
@param null|string $expiry Unused.
@return boolean `true` on successful write, `false` otherwise.
Write values to the cache .