imageellipse
    (PHP 4 >= 4.0.6, PHP 5)
imageellipse -- Draw an ellipse
Description
bool 
imageellipse ( resource image, int cx, int cy, int w, int h, int color )
    imageellipse() draws an ellipse centered at
    cx, cy (top left is
    0, 0) in the image represented by image.
    W and h specifies the
    ellipse's width and height respectively. The color of the ellipse is
    specified by color.
   
    
Example 1. imageellipse() example 
<?php
  // create a blank image $image = imagecreatetruecolor(400, 300);
  // fill the background color $bg = imagecolorallocate($image, 0, 0, 0);
  // choose a color for the ellipse $col_ellipse = imagecolorallocate($image, 255, 255, 255);
  // draw the ellipse imageellipse($image, 200, 150, 300, 200, $col_ellipse);
  // output the picture header("Content-type: image/png"); imagepng($image);
  ?>
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    See also imagefilledellipse() and
    imagearc().