I have no idea how this is different from radialBlurImage. radialBlur is deprecated in ImageMagick
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Image
function rotationalBlurImage($imagePath)
{
    $imagick = new \Imagick(realpath($imagePath));
    $imagick->rotationalBlurImage(3);
    $imagick->rotationalBlurImage(5);
    $imagick->rotationalBlurImage(7);
    header("Content-Type: image/jpg");
    echo $imagick->getImageBlob();
}