用php的GD库画不出水平的虚线解决方法

用php的GD库画不出水平的虚线
运行一下以下代码

PHP code

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-->$img = imagecreatetruecolor(600, 600);
$white = imagecolorallocate($img, 255, 255, 255);
imagedashedline($img, 20, 20, 500, 20, $white);
imagedashedline($img, 20, 20, 20, 500, $white);
header("content-type:image/jpeg");
imagejpeg($img);
imagedestroy($img);

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PHP code

$img = imagecreatetruecolor(600, 600);
$white = imagecolorallocate($img, 255, 255, 255);
$red = imagecolorallocate($img, 255, 0, 0);

$style = array($red, $red, $red, $red, $red, $white, $white, $white, $white, $white);
imagesetstyle($img, $style);
imageline($img, 20, 20, 500, 20, IMG_COLOR_STYLED);

header("content-type:image/jpeg");
imagejpeg($img);
imagedestroy($img);
<br><font color="#e78608">------解决方案--------------------</font><br>The bug reported by 'michi at marel dot at' also exists in PHP version 5.1.1. This functions just works with vertical lines! 5.1.1版本发现的BUG，反对使用本函数。应该用 imagesetstyle() 和 imageline() 的组合替代之
<br><font color="#e78608">------解决方案--------------------</font><br>This functions just works with vertical lines!该函数只能画垂直线！
<br><font color="#e78608">------解决方案--------------------</font><br>确实，GD库只能画竖直的虚线！ <div class="clear">
                 
              
              
        
            </div>

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