I've got an Excel file with text in Hindi which I'm trying to read via PHP but I only get gibberish out of it.

When I open the .xls File with Numbers, the text looks like this:

But when I copy and paste this exact text here it looks like this:

ß[+kq'kh ge ij fuHkZj djrh gSAÞ

When I read it via PHP I get exactly the same gibberish text.

Is this an encoding problem in the .xls file and is it somehow possible to extract a UTF-8 encoded version from it?