<?php 
        $image = imagecreatefromjpeg("UNICORN.JPG"); 
        $displacement = displacement($image); 
        $image = imagedisplace($image,$displacement); 
        header("Content-type: image/jpeg"); 
        imagejpeg($image); 
        //imagejpeg($image, ('SWIRL.JPG')); 
        imagedestroy($image); 
        function displacement($i) { 
                $width = imagesx($i); 
                $height = imagesy($i); 
                //INCREASE DEGREE FOR MORE SWIRL
                $fDegree = 0.02; 
                for ($y=0;$y<$height;$y++) { 
                        for ($x=0;$x<$width;$x++) { 
                             $pos_x = $x - ($width/2); 
                            $pos_y = $y - ($height/2); 
                    $theta = atan2(($pos_y),($pos_x)); 
        $radius = sqrt($pos_x*$pos_x + $pos_y*$pos_y); 
                                $newX = ($width/2) + ($radius * cos($theta + ($fDegree * $radius))); if ($newX > 0 && $newX < $width) { 
                                       $dis_x = $newX; 
                                } else { 
                                        $dis_x = $x; 
                                } 
                                $newY = ($height/2) + ($radius * sin($theta + ($fDegree * $radius))); if ($newY > 0 && $newY < $height) { 
                                       $dis_y = $newY; 
                                } else { 
                                        $dis_y = $y; 
                                } 
     $dis_x = ($dis_x < 0) ? $dis_x + $width : $dis_x; 
                                $dis_x = ($dis_x >= $width) ? $dis_x - $width : $dis_x; $dis_y = ($dis_y < 0) ? $dis_y + $height : $dis_y; 
                                $dis_y = ($dis_y >= $height) ? $dis_y - $height : $dis_y; 
                  $displacement['x'][$x][$y] = $dis_x; 
                  $displacement['y'][$x][$y] = $dis_y; 
                        } 
                } 
                return $displacement; 
                
        } 
        function imagedisplace($i,$displacement) { 
                $width = imagesx($i); 
                $height = imagesy($i); 
         $temp = imagecreatetruecolor($width,$height); 
           imagecopy($temp,$i,0,0,0,0,$width,$height); 
                for ($y=0;$y<$height;$y++) { 
                        for ($x=0;$x<$width;$x++) { 
                                $rgb = imagecolorat($temp,$displacement['x'][$x][$y],$displacement['y'][$x][$y]); $a = ($rgb >> 24) & 0xFF; $r = ($rgb >> 16) & 0xFF; $g = ($rgb >> 8) & 0xFF; 
                                $b = $rgb & 0xFF; 
       $col = imagecolorallocatealpha($i,$r,$g,$b,$a); 
                         imagesetpixel($i,$x,$y,$col); 
                        } 
                } 
                imagedestroy($temp); 
                return $i; 
        } 
?>