(PECL gmagick >= Unknown)
Gmagick::flopimage — Creates a horizontal mirror image
public Gmagick::flopimage(): Gmagick
Creates a horizontal mirror image by reflecting the pixels around the central y-axis.
This function has no parameters.
The flopped Gmagick object.
Throws an GmagickException on error.
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https://www.php.net/manual/en/gmagick.flopimage.php