PHP imagearc() Function: Drawing an Elliptical Arc

The imagearc() function in PHP's GD library draws an elliptical arc on an image resource. It takes the image resource, center coordinates ( $cx, $cy), width ( $w), height ( $h), start angle ( $s), end angle ( $e), and color ( $color) as parameters.

The start angle is measured clockwise from the 3 o'clock position. The function returns the transformed image on success, or FALSE on failure.

Example usage:

<?php
// Create a 200x200 image
$img = imagecreatetruecolor(200, 200);
// Allocate colors
$white = imagecolorallocate($img, 255, 255, 255);
$black = imagecolorallocate($img, 0, 0, 0);
// Draw a black ellipse arc
imagearc($img, 100, 100, 150, 150, 0, 360, $black);
// Output the image
header("Content-type: image/png");
imagepng($img);
imagedestroy($img);
?>