php – 使用imagettftext下划线文本

我的问题是,如何为图像中的所有文字加下划线？代码：

function createImage($text)
{
    $text .= "\n";
    $text = wordwrap($text, 40, "\n");
    $newlines = substr_count($text, "\n");
    if($newlines == 0)
    {
        $height = 30;
    }
    else
    {
        $height = 30*$newlines-$newlines*7;
    }
    putenv('GDFONTPATH=' . realpath('.'));
    header('Content-Type: image/png');

    $im = imagecreatetruecolor(315, $height);
    $white = imagecolorallocate($im, 255, 255, 255);
    $grey = imagecolorallocate($im, 128, 128, 128);
    $black = imagecolorallocate($im, 0, 0, 0);
    $purple = imagecolorallocate($im, 97, 26, 139);
    imagefilledrectangle($im, 0, 0, 399, $height, $white);
    $font = 'arialbd.ttf';

    imagettftext($im, 11, 0, 10, 20, $purple, $font, $text);
    imagepng($im);
    imagedestroy($im);
}

createImage("Stackoverflow Stackoverflow Stackoverflow Stackoverflow Stackoverflow Stackoverflow Stackoverflow Stackoverflow Stackoverflow Stackoverflow Stackoverflow Stackoverflow ");

结果
http://i.imgur.com/Jdr7HPy.png
我希望所有文字都加下划线,我找到了一些解决方案,但它们只是从左到右,不依赖于单词.

解决方法:

使用Unicode下划线组合字符U 0332.

你需要一个循环或聪明的数组合并来修改文本,

$e = explode(' ', $text);

for($i=0;$i<count($e);$i++) {
  $e[$i] = implode('&#x0332;', str_split($e[$i]));
}

$text = implode(' ', $e);