(PECL imagick 2.0.0)
Imagick::flopImage — Creates a horizontal mirror image
Creates a horizontal mirror image by reflecting the pixels around the central y-axis.
成功时返回 TRUE。
错误时抛出 ImagickException。
Lee (2012-06-06 20:11:16)
They mean, "Creates a vertical mirror image by reflecting the pixels around the central x-axis."