使用 GD ( imagettftext() ) 和 UTF-8 字符

问题描述

只是为了记录 - 我在这里的第一个问题，但希望不是我在社区中的最后一个输入.但这不是我在这里的原因.

Just for the record - my first question here but hopefully not my last input in the community. But that's not why I'm here.

我目前正在开发一个简单的系统，该系统必须生成带有文本的图像.一切都很顺利，直到我意识到 GD 无法处理像

I'm currently developing a simple system that has to generate an image with a text on it. Everthing went well until I realised that GD cannot handle UTF-8 characters like

ā, č, ž, ä, ø, é

ā, č, ž, ä, ø, é

等等.

为了解决问题 - 我正在使用 imagettftext()

为了解决我的问题，我深入谷歌搜索并返回了一些解决方案，但遗憾的是，没有一个解决方案完全解决了我的问题.目前我正在使用我在这个线程中找到的这个脚本 - PHP 函数 imagettftext() 和 unicode

Trying to solve my problem I dug into depths of google and some solutions were returned, none of them, sadly, solved my problem completely. Currently I'm using this script I found in this thread - PHP function imagettftext() and unicode

private function properText($text){

    // Convert UTF-8 string to HTML entities
    $text = mb_convert_encoding($text, 'HTML-ENTITIES',"UTF-8");
    // Convert HTML entities into ISO-8859-1
    $text = html_entity_decode($text,ENT_NOQUOTES, "ISO-8859-1");
    // Convert characters > 127 into their hexidecimal equivalents
    $out = "";
    for($i = 0; $i < strlen($text); $i++) {
        $letter = $text[$i];
        $num = ord($letter);
        if($num>127) {
          $out .= "&#$num;";
        } else {
          $out .=  $letter;
        }
    }

    return $out;

}

它适用于某些字符，但不是所有字符，例如，带有变音符号的转换不正确.

and it works fine for some characters but not all of them, for example, a with umlaut isn't converted correctly.

所以在这一点上，我不知道去哪里寻找什么，因为我无法预测用户输入.更准确地说，系统从 xml 提要中提取艺术家姓名并使用数据生成图像(我不打算支持象形文字).

So at this point I'm not sure where and what to look for anymore as I cannot predict the user input. To be more precise, the system is pulling artist names from an xml feed and using the data for the image generation (I'm not planning to support hieroglyphs).

我使用 PHP 的 mb_detect_encoding() 并且我确保当前未正确显示的所有字符都包含在我提供给 imagettftext()<的字体文件中/em>使用 windows charmap 工具检查它的功能.

José González -> 4a6f73c3a920476f6e7ac3a16c657a
// input -> bin2hex(input)

$text = mb_convert_encoding($text, "HTML-ENTITIES", "UTF-8");
$text = preg_replace('~^(&([a-zA-Z0-9]);)~',htmlentities('${1}'),$text);
return($text); 

private function properText($text){
    $text = mb_convert_encoding($text, "HTML-ENTITIES", "UTF-8");
    $text = preg_replace('~^(&([a-zA-Z0-9]);)~',htmlentities('${1}'),$text);
    return($text); 
}