Method getDestination

/**
 * Get the lines of a destination file
 *
 * @param   string  $dst  The path of a destination file
 * @param   string  $src  The path of a source file
 *
 * @return  array  The lines of the destination file
 *
 * @since   3.0.0
 */
protected function &getDestination($dst, $src)
{
    if (!isset($this->destinations[$dst])) {
        $this->destinations[$dst] = $this->getSource($src);
    }
    return $this->destinations[$dst];
}