在PHP中读取PDF元数据 [英] Reading PDF metadata in PHP

问题描述

我正在尝试读取附加到任意PDF的元数据:标题，作者，主题和关键字.

I'm trying to read metadata attached to arbitrary PDFs: title, author, subject, and keywords.

是否有一个PHP库(最好是开源库)可以读取PDF元数据?如果是这样，或者如果没有，那么如何使用该库(或缺少库)来提取元数据?

Is there a PHP library, preferably open-source, that can read PDF metadata? If so, or if there isn't, how would one use the library (or lack thereof) to extract the metadata?

需要明确的是，我对创建或修改PDF或其元数据不感兴趣，而且我也不关心PDF正文.我看过许多库，包括FPDF(每个人似乎都建议这样做)，但它似乎仅用于PDF创建，而不用于元数据提取.

To be clear, I'm not interested in creating or modifying PDFs or their metadata, and I don't care about the PDF bodies. I've looked at a number of libraries, including FPDF (which everyone seems to recommend), but it appears only to be for PDF creation, not metadata extraction.

推荐答案

Zend框架包括 Zend_Pdf ，这真的很容易:

The Zend framework includes Zend_Pdf, which makes this really easy:

$pdf = Zend_Pdf::load($pdfPath);

echo $pdf->properties['Title'] . "\n";
echo $pdf->properties['Author'] . "\n";

限制:仅适用于小于16MB的未加密文件.

Limitations: Works only on files without encryption smaller then 16MB.

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