Use  YUM to install :

yum --enablerepo=remi update php-\*

Notice : now, all extensions are provided for php-cli and php (module for apache in prefork mode) and php-zts (module for apache in worker mode). Read the entry PHP 5.3, MPM worker, zts and mysqlnd (yes I know, pecl extensions are not yet available).

For all questions or help, please use the Forums.

P.S. RPM available in my repo are backport of Fedora 12 ones, but updated (php-zts extensions, php-oci8, php-mime_magic, php-sqlite2).