PHP好玩的代码

$width = 600;
        $height = 650;
        header("Content-type: image/gif");
        $img = imagecreate($width, $height);
        $bg_color = imagecolorallocate($img, 0, 0, 0);
        $red = imagecolorallocate($img, 255, 0, 0);
        for ($i = 0; $i <= 100; $i++) {
             for ($j = 0; $j <= 100; $j++) {
               $r = M_PI / 50 * $i * (1 - sin(M_PI / 50 * $j)) * 40;
        $x = $r * cos(M_PI / 50 * $j) * sin(M_PI / 50 * $i) + $width / 2;
        $y = -$r * sin(M_PI / 50 * $j) + $height / 6;
        imagesetpixel($img, $x, $y, $red);
         }
        }
        imagegif($img);
        imagedestroy($img);exit;
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