RPM of PHP 5.3.13 are available for Enterprise Linux in remi repository.
RPM of PHP 5.4.3 are available for Fedora in remi repository and for Enterprise Linux in remi-test repository.
Read the announcement : PHP 5.3.13 and PHP 5.4.3 Released!
Use YUM to install : yum --enablerepo=remi update php-\* This versions will also be soon available in the official updates for: Fedora 17 - PHP 5.4.3 Fedora 16 - PHP 5.3.13 Fedora 15 - PHP 5.3.13 For all questions or help, please use the Forums.... Lire php-5.3.13 and php-5.4.3