使用 MPDF 生成 pdf,不间断 space 显示为不受支持的字符

generating pdf with MPDF, non breaking space displayed as unsupoprted characters

使用 Mpdf 8.0.8,我创建了一个自定义字体的文档,它显示良好,但不间断的 spaces 除外,它显示为交叉正方形:

当用 FontForge 打开我的字体时,我看到 uni00A0 字符被定义(它是空白的,但没有叉号)

调用Mpdf的代码如下:

public function getPdfData($values, $medias, $locale = 'fr_FR')
{
    $sessionLocale = $this->translator->getLocale();
    $this->translator->setLocale($locale);
    $html = $this->twig->render('@Pim/testPdf.html.twig');
    $this->translator->setLocale($sessionLocale);

    $defaultConfig = (new \Mpdf\Config\ConfigVariables())->getDefaults();
    $fontDirs = $defaultConfig['fontDir'];

    $defaultFontConfig = (new \Mpdf\Config\FontVariables())->getDefaults();
    $fontData = $defaultFontConfig['fontdata'];

    $fontData = $fontData + [
            'myhelvet' => [
                'R' => 'helvetlight.ttf',
                'I' => 'helvetthick.ttf',
            ],
            'timeslightitalic' => [
                'R' => 'timeslightitalic.ttf'
            ]
        ];
    $defaultFont = 'myhelvet';

    $mpdf = new \Mpdf\Mpdf([
        'orientation' => 'L',
        'margin_left' => 0,
        'margin_right' => 0,
        'margin_top' => 1,
        'margin_bottom' => 0,
        'fontDir' => array_merge($fontDirs, [
            __DIR__ . '/../Resources/public/fonts',
        ]),
        'fontdata' => $fontData,
        'default_font' => $defaultFont,
        'mode' => '+aCJK',
        "autoScriptToLang" => true,
        "autoLangToFont" => true,
    ]);
    $mpdf->addFontDirectory(__DIR__ . '/../Resources/public/fonts');
    $mpdf->WriteHTML($html);
    $pdfData = $mpdf->Output('', 'S');

    return $pdfData;
}

html 视图无法呈现由 Php NumberFormatter 创建的非中断 space:

<!DOCTYPE html>
<html>
<head>
    <title></title>
    <meta http-equiv="content-type" content="text/html; charset=utf-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
</head>
<body>

<div style="font-family: myhelvet">Formatting a number: {{ '20000'|numberFormatLocale('fr_FR') }}</div>

</body>
</html>

最后,php 代码生成中断 space(一个 Twig 过滤器):

public static function numberFormatLocale($number, $locale)
{
    $formatter = new \NumberFormatter($locale, \NumberFormatter::DECIMAL);

    return $formatter->format($number);
}

NumberFormatter 的输出不是 U+00A0,而是 0xE2 0x80 0xAf,或 U+202F - NARROW NO-BREAK SPACE 这很可能不受字体支持。