TCPDF 对 base64 图像有限制吗？

Question

我正在将 TCPDF 安装从 4.9 版升级到 6.4.2 版，发现 base64 图像有一个奇怪的行为。

https://tcpdf.org/examples/example_009/ 中的示例图像正确加载了 base64“PHP 规则”图像，但我无法显示任何其他有效的 base64 图像。相反，我看到的是没有图像的空白 PDF 页面。

我缩小了 TCPDF 文档中的示例 009 以找出问题：

这会加载“PHP 规则”图像

require_once('tcpdf_include.php');
$pdf = new TCPDF();
$pdf->AddPage();
$img_encoded = 'iVBORw0KGgoAAAANSUhEUgAAABwAAAASCAMAAAB/2U7WAAAABlBMVEUAAAD///+l2Z/dAAAASUlEQVR4XqWQUQoAIAxC2/0vXZDrEX4IJTRkb7lobNUStXsB0jIXIAMSsQnWlsV+wULF4Avk9fLq2r8a5HSE35Q3eO2XP1A1wQkZSgETvDtKdQAAAABJRU5ErkJggg==';
$imgdata = base64_decode($img_encoded);
$pdf->Image('@'.$imgdata);
$pdf->Output('example_009.pdf', 'I');

这会生成空白 PDF 页面，而不是添加卷曲绘图：

require_once('tcpdf_include.php');
$pdf = new TCPDF();
$pdf->AddPage();
$img_encoded ='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';
$imgdata = base64_decode($img_encoded);
$pdf->Image('@'.$imgdata);
$pdf->Output('example_009.pdf', 'I');

我已经验证了 base64 代码 (https://base64.guru/converter/decode/image) 并且完整的 base64 图像在浏览器中正确加载： data:image/png;base64,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

这会生成空白 PDF 页面，而不是添加绿色方块：

require_once('tcpdf_include.php');
$pdf = new TCPDF();
$pdf->AddPage();
$img_encoded ='iVBORw0KGgoAAAANSUhEUgAAACgAAAAoCAYAAACM/rhtAAAANklEQVR42u3OQQ0AAAgEoDO50TWFmw9IQGXSeawEBQUFBQUFBQUFBQUFBQUFBQUFBQUFBQVvLDGRO9mhGZRRAAAAAElFTkSuQmCC';
$imgdata = base64_decode($img_encoded);
$pdf->Image('@'.$imgdata);
$pdf->Output('example_009.pdf', 'I');

我已经验证了 base64 代码 (https://base64.guru/converter/decode/image) 并且完整的 base64 图像在浏览器中正确加载： data:image/png;base64,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

data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAACgAAAAoCAYAAACM/rhtAAAANklEQVR42u3OQQ0AAAgEoDO50TWFmw9IQGXSeawEBQUFBQUFBQUFBQUFBQUFBQUFBQUFBQVvLDGRO9mhGZRRAAAAAElFTkSuQmCC

我从一些帖子中知道有人推荐标签然后写成 HTML，尽管我希望直接使用 base64 图像作为图像。

关于为什么示例中的 base64 有效，但所有其他的都失败的任何想法？

Answer 1

这是 K_PATH_CACHE 变量的文件夹问题。

通过更多实验，我发现任何 PNG 文件都不会添加到让我查看 tcpdf.php 文件的 PDF 中。这导致错误日志并最终导致常量 K_PATH_CACHE.

imgpng() 函数使用 K_PATH_CACHE 在 PHP 安装（通过 AWS Lightsail 的 Bitnami）中定义 /tmp 的位置，但位置定义不正确。

K_PATH_CACHE 的默认值设置为 /opt/bitnami/php/tmp，但该文件夹为空。实际的 tmp 文件夹位于 /tmp.

为了解决这个问题，我将 K_PATH_CACHE 的位置重新定义为在其他所有内容之前加载的配置文件中的实际 /tmp 目录：

define('K_PATH_CACHE', '/tmp/');

现在可以从 base64 字符串和文件形式加载 PNG。

我希望这可以节省几个小时的搜索时间！

TCPDF 对 base64 图像有限制吗？

Does TCPDF have limits on base64 images?

php

base64

png

tcpdf