unserialize() Error at Offset… Different solutions

The problem is not always obvious, for example the error message in relation to the function unserialize(). If you look around the net to help you find countless search and few answers, because usually the problem lies in the source, in the passed value. But not always you can control it, especially in debugging helpers there are different contents.

To help some people who are seeking help, here are some solutions you can work with. Some are to be used only in conjunction with WordPress, because the function comes from the core. But there are similar things, of course, even without WP.
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Pretty permalinks without mod_rewrite

There are still some third-class web hosters who do allow the .htaccess files … and turn off the standard module mod_rewrite. But without mod_rewrite, WordPress cannot use pretty permalinks, right? Wrong!

There’s another directive we can use: ErrorDocument.

ErrorDocument 404 /index.php

This will do almost the same as the rewrite rules WordPress offers. It will not work with caching plugins like W3 Total Cache, it will not catch empty searches and other .htaccess tricks you may want to use. So consider this trick as a temporary solution until you have found a real web hoster.