(PECL gmagick >= Unknown)
Gmagick::flipimage — Creates a vertical mirror image
public Gmagick::flipimage ( ) : Gmagick
Creates a vertical mirror image by reflecting the pixels around the central x-axis.
The flipped Gmagick object.
Throws an GmagickException on error.
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https://www.php.net/manual/en/gmagick.flipimage.php