Irrespective of the fact that how hard you try to test your PHP applications before finally putting them in implementation, it is always necessary to put ship code to your server that has flaws and bugs. Few of them could be extremely fierce and require to be fixed before even causing extreme damage to your application data. Read more to do effective PHP bug tracking.
http://www.phpclasses.org/blog/package/1351/post/1-10-Steps-to-properly-do-PHP-Bug-Tracking-and-Fixing-as-Fast-as-possible.html