是否可以将pdf文件作为txt读取？

Question

I need to find a certain key in a pdf file. As far as I know the only way to do that is to interpret a pdf as txt file. I want to do this in PHP without installing a addon/framework/etc.

Thanks

Answer 1

You can certainly open a PDF file as text. PDF file format is actually a collection of objects. There is a header in the first line that tells you the version. You would then go to the bottom to find the offset to the start of the xref table that tells where all the objects are located. The contents of individual objects in the file, like graphics, are often binary and compressed. The 1.7 specification can be found here.