Magento PHP 5.4 Patches
January 22, 2014
Magento versions up to 1.8.1.0 are not compatible with PHP 5.4 without being patched. For those that are not able to use the patch files provided by Magento to make Magento installation compatible with PHP 5.4 we have generated pre-patched files that can be used instead. You simply need to overwrite the existing files with the new versions that have been patched. If you have modified any of the existing files included in the patch you will need to reapply those changes to the patched files, you can check for modifications by comparing the files in "original" folder with the files on your website. Once the files have been replaced make sure to empty the Magento cache.