I had an issue… I couldn’t upgrade my WordPress to 2.8.5 because of an error: ‘PCLZIP_ERR_BAD_FORMAT (-10)’. What is it and how to fix that problem?

Answer is really simple:
comment mbstring.func_overload in your php.ini!

I was fighting with that for a few days… now I know that it was the problem.

What is mbstring.func_overload? From the php.ini:

overload(replace) single byte functions by mbstring functions.
mail(), ereg(), etc are overloaded by mb_send_mail(), mb_ereg(),
etc. Possible values are 0,1,2,4 or combination of them.
For example, 7 for overload everything.
0: No overload
1: Overload mail() function
2: Overload str*() functions
4: Overload ereg*() functions

And some more informations about overloading you can find on php.net.

After you comment this line in php.ini – restart your web server.

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Hello, I'm Karol Zielinski, internet evangelist, an entrepreneur, project manager and a web developer from Gdynia, Poland. I like creative design, good advertisement, social media and all kind of stuff around the web.

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