public function getHorizontalResolution()
    {
        if (!isset($this->data[self::HORIZONTAL_RESOLUTION])) {
            return false;
        }

        return $this->data[self::HORIZONTAL_RESOLUTION];
    }
public function getHorizontalResolution()
    {
        if (!isset($this->data[self::HORIZONTAL_RESOLUTION])) {
            return false;
        }

        return $this->data[self::HORIZONTAL_RESOLUTION];
    }
public function getHorizontalResolution ( ) { if ( ! isset ( $ this -> data [ self :: HORIZONTAL_RESOLUTION ] ) ) { return false ; } return $ this -> data [ self :: HORIZONTAL_RESOLUTION ] ; }
Returns the horizontal resolution in DPI, if it exists

@return int|boolean
Returns the horizontal resolution in DPI if it exists