非常有用,可以构建一个具有颜色渐变的伪球体...
<?php
$width = 300;
$center = $width / 2;
$colordivs = 255 / $center;
$im = @imagecreate($width, $width);
$back_color = imagecolorallocate($im, 20, 30, 40);
imagefill($im, 0, 0, $back_color);
for ($i = 0; $i <= $center; $i++)
{
$diametre = $width - 2 * $i;
$el_color = imagecolorallocate($im, $i * $colordivs, 0, 0);
imagearc($im, $center, $center, $diametre, $diametre, 0, 360, $el_color);
imagefilltoborder($im, $center, $center, $el_color, $el_color);
}
imagepng($im);
?>
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