I run a job board (jamit). Recently I upgraded my server to Apache 2.4.7 and PHP to 5 (5.4.25). Since that, special characters such as (·Â Â Â Â Â Â Â Â ) appear in form input (textarea field). I am sure before the upgrade, there was no such issue. I believe it was caused by the new version of Php.
Since jamit board has stopped development. I really need to solve this issue otherwise I have to edit manually ever job post.
Just taking a wild guess here but since you mentioned the upgrade to PHP 5.4.x and if you were not serving your pages as utf-8 before it may be the default_charset. Here is the note from the changelog, particularly the entry found in 5.4.0 itself:
Changed default value of "default_charset" php.ini option from ISO-8859-1 to UTF-8.