[mlnn]

<?php

// example4.php

// set the HTTP header type to PNG
header("Content-type: image/png"); 

// set the width and height of the new image in pixels
$width = 350;
$height = 360;

// create a pointer to a new true colour image
$im = ImageCreateTrueColor($width, $height); 

// switch on image antialising if it is available
ImageAntiAlias($im, true);

// sets background to white
$white = ImageColorAllocate($im, 255, 255, 255); 
ImageFillToBorder($im, 0, 0, $white, $white);

// define black and blue colours
$black = ImageColorAllocate($im, 0, 0, 0);
$blue = ImageColorAllocate($im, 0, 0, 255);

// draw an empty circle
ImageEllipse($im, 180, 100, 100, 100, $black);

// draw a filled ellipse
ImageFilledEllipse($im, 180, 220, 150, 50, $blue);

// send the new PNG image to the browser
ImagePNG($im); 

// destroy the reference pointer to the image in memory to free up resources
ImageDestroy($im); 

?>

View Example 4 

To draw a circle or an ellipse, we use the same ImageEllipse function. The parameters provided to this function are: image resource, center x, center y, width, height, colour. As you can see from the above example, all you need to do to draw a circle rather than an ellipse is to set the width and height to the same value.

מקור:
http://www.design-ireland.net/index....imagery-15.php