Drupal 6 on PHP Greater than PHP 5.3
Notes on running Drupal 6 on PHP 5.4
Here is a StackExchange post in which MikeyTown2 lists a collection of patches he uses to run Drupal 6 sites on PHP 5.4: http://drupal.stackexchange.com/a/154964
Available Wiki Topics
The operator of this site makes no claims, promises, or guarantees of the accuracy, completeness, originality, uniqueness, or even general adequacy of the contents herein and expressly disclaims liability for errors and omissions in the contents of this website.