strcmp() expects parameter 2 to be string error on configuration and system status page
It looks like this issue can occur if two modules return the same array key from hook_requirements?

Here's a similar result affecting LinkedIn Integration:


#1711604: On installation errors reported from system.module and system.admin.inc


According to that issue, this will happen if two separate modules add a requirements check with a key of curl. The solution is to namespace requirements checks (use a key of linkedin_curl, simpletest_curl and so forth).

You could debug this and check the issue queue for the affected module(s).


Disabling the most recently added modules might help you identify the cause (see if the symptom goes away).
If you still feel stuck and don't feel able to dig further, try updating your question with the list of enabled modules on your site. That may help narrow it down.
If you're running all contrib modules, googling for "strcmp _system_sort_requirements drupal" might show results that help you identify the affected module.
If you have Drush + Devel module, try drush fn-hook requirements to see which installed modules are implementing hook_requirements.
Or just start hacking on your system settings page and trace the problem down old-school :)


If this is the cause, once you identify the module(s) causing the issue you should check the issue queue, file an issue if none already exists, and help be a part of getting it fixed!

I've tagged several affected modules in #933684 - Same requirements from different modules causes warnings in _system_sort_requirements()