Drawing Arcs, Ellipses, and Circles with PHP

The first parameter is the canvas. The next two parameters are the x and y coordinates for the center position of the arc. After that comes the arc width and height. Since a circle is an arc with the same width and height, to draw a circle, set both numbers to the diameter of the circle. The sixth and seventh parameters are the starting and ending angles, in degrees.

Draw an arc, use ImageArc( ):

ImageArc($image, $x, $y, $width, $height, $start, $end, $color);

Draw an ellipse, use ImageArc( ) and set $start to 0 and $end to 360:

ImageArc($image, $x, $y, $width, $height, 0, 360, $color);

Draw a circle, use ImageArc( ), set $start to 0, set $end to 360, and use the same value for both $width and $height:

ImageArc($image, $x, $y, $diameter, $diameter, 0, 360, $color);