(PECL imagick 2.0.0)
Imagick::swirlImage — Swirls the pixels about the center of the image
$degrees
   )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.
degrees
   Returns TRUE on success.
  
Throws ImagickException on error.
Example #1 Imagick::swirlImage()
<?php
function swirlImage($imagePath, $swirl) {
    $imagick = new \Imagick(realpath($imagePath));
    $imagick->swirlImage($swirl);
    header("Content-Type: image/jpg");
    echo $imagick->getImageBlob();
}
?>