Magento is continuing to advance its platform and make development more efficient by adding support for PHP 5.4. Moving to PHP 5.4 offers several advantages, including better performance, more efficient memory usage, and access to ongoing updates and security fixes.
To ensure that we can take advantage of these valuable updates, updated patches have been released for Magento Enterprise Edition 184.108.40.206 and later releases and for Magento Community Edition 220.127.116.11 and later releases. Support for PHP 5.4 will also be built in to future Magento product releases.
This is welcome news within the magento community as PHP 5.4.0 was launched back in March of 2012. Most current installations rely on PHP 5.2, however that will most likely change with the latest support update.