The problem is that your current PHP RPM packages can not be upgraded with the new RPM packages trough the new repository.

Also these errors:

--> Processing Dependency: php-api = 20041225 for package: php-pecl-memcache
--> Processing Dependency: php-api = 20041225 for package: php-readline
--> Processing Dependency: php-api = 20041225 for package: php-tidy
--> Processing Dependency: php-api = 20041225 for package: php-mhash
--> Processing Dependency: php-api = 20041225 for package: php-mssql
--> Processing Dependency: php-api = 20041225 for package: php-mcrypt

Are because these are PECL modules that depend on the php-api version, which is for PHP 5.3.4 different than the current version.

You can remove the current PHP installation and then reinstall the new RPM packages and install PECL part manually if there are no RPM packages.

Also, I can be available to help you, please PM me or email at abiko@gmx.com

Thank you!