(PECL gmagick >= Unknown)
Gmagick::swirlimage — Swirls the pixels about the center of the image
public Gmagick::swirlimage(float $degrees): Gmagick
Swirls the pixels about the center of the image, where degrees indicates the sweep of the arc through which each pixel is moved. You get a more dramatic effect as the degrees move from 1 to 360.
degreesDefine the tightness of the swirling effect.
The Gmagick object.
Throws an GmagickException on error.
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https://www.php.net/manual/en/gmagick.swirlimage.php