php绘制奥运五环(GD)

<?php
$img = imagecreate(470,250);//创建图片
$bg_color = imagecolorallocate($img,120,0,0);//设置图片背景
$blue = imagecolorallocate($img,0,255,255);
$yello = imagecolorallocate($img,255,255,0);
$black = imagecolorallocate($img,0,0,0);
$green = imagecolorallocate($img,0,255,0);
$red = imagecolorallocate($img,255,0,0);
$color = array($blue,$black,$red,$yello,$green);
//奥运圆圈的半径为70. 2个圆的圆心距离为半径*2-10第一个圆的圆心坐标(100,100)
$x = array(100,100+130,100+130+130,(100+(100+130))/2,(100+(100+130))/2+130);
$y = array(100,100,100,100+65,100+65);
for($i=0;$i<5;$i++){    imagearc($img,$x[$i],$y[$i],140,140,0,360,$color[$i]);}
header("Content-type: image/png");
imagepng($img);
imagedestroy($img);
?>