public function dec($property, $value = 1) {
		if (isset($this->_data[$property])) {
			$this->_data[$property] -= $value;
		} else {
			$this->_data[$property] =- $value;
		}
		
		$this->_changed[$property] = true;
		
		return $this->_data[$property];
	}
public function dec($property, $value = 1) {
		if (isset($this->_data[$property])) {
			$this->_data[$property] -= $value;
		} else {
			$this->_data[$property] =- $value;
		}
		
		$this->_changed[$property] = true;
		
		return $this->_data[$property];
	}
public function dec ( $ property , $ value = 1 ) { if ( isset ( $ this -> _data [ $ property ] ) ) { $ this -> _data [ $ property ] -= $ value ; } else { $ this -> _data [ $ property ] = - $ value ; } $ this -> _changed [ $ property ] = true ; return $ this -> _data [ $ property ] ; }
Decrease a value of the property
Property will be created if not exists

@param  string $property
@param  int    $value
@return int
Decrease a value of the property Property will be created if not exists