This seems to having to do with the URL encoding around the package_name[]= value in the URL.

On the first search page the value is:
package_name[]=Documentation+problem

Which turns into:
package_name[]=%27Documentation+problem%27

So I guess somewhere we are wrapping it quotation when generating the link to the next page

php4fan, hello, please, thank you.

First of all, thank you for your kind report and motivational and inspirational request to fix something that is broken. Keep in mind that the language you're using here reflects our community also that you are a part of whether you like it or not. Younger people learn from such report requests and they continue the low level communication. So for the sake of other people be a better example.

So, if you can, instead of using words that show your intelligence, communication and empathy levels, please send a pull request if you have any hints what might be wrong. The repository is almost entirely open sourced on GitHub. I agree, the application is beyond the quality levels we're used to in the PHP world and also to fix it properly it is a project to almost rewrite majority of it but maybe it can be fixed. 

I have few clues what might be happening here with the database and how to fix it. This level of language used here didn't much motivate me to move forward to the fix yet, but I'll try to move past this.

Our next feature will most certainly need to be to also fix the communication level in the bug tracker. Either with bans, with mutes, ignores for certain time periods or similar actions. This might be a more interesting side project...

Thank you.

> This level of language used here didn't much motivate me
> to move forward to the fix yet, but I'll try to move past this.

Oh, I'm sorry I didn't motivate you enough.
I have a suggestion: try to think about how the issue affects everybody else and yourself, rather than me. I deserve the issue because of my language and attitude, but everybody else doesn't, including you. So maybe, by focusing on the issue itself and how it affects good people, you may find the motivation ;)

@php4fan at gmail dot com:

The PHP Project is not a paid enterprise, people like me and petk@ are just like you, users of PHP who spend our free time on making the project run. Try to put that in perspective how many millions of people our limited resources has to serve.

php4fan, these are much more normal sentences. Please use such latter language more often because the open source bug fixes depend on such good responses. The proper and much more humane response now motivated me to fix this issue. Thank you for being able to communicate more properly and being helpful in contributing a bug report. Case resolved...