How to upgrade to php 5.1.4 & APC 3.0.12

See also Upgrading to PHP 5.2.1

1. EDIT: /etc/yum.repos.d/CentOS-Base.repo
Add:

[c4-testing]
name=CentOS-4 Testing
baseurl=http://dev.centos.org/centos/$releasever/testing/$basearch/
enabled=1
gpgcheck=1
gpgkey=http://dev.centos.org/centos/RPM-GPG-KEY-CentOS-testing

Exclude mysql from centos-plus:

#additional packages that extend functionality of existing packages
[centosplus]
name=CentOS-$releasever - Plus
baseurl=http://mirror.centos.org/centos/$releasever/centosplus/$basearch/
gpgcheck=1
enabled=1
exclude=kernel*,xfsprogs*,mysql*

2. UPGRADE/INSTALL:

$ yum remove php
$ yum install php php-devel php-gd php-mysql php-pear php-pgsql php-soap php-xml httpd-devel
$ sudo pear install DB

3. TEST:

make sure phpInfo shows php 5.1.4 and that the mysql works

5. INSTALL:

wget http://pecl.php.net/get/APC-3.0.12.tgz
tar xvzf APC-3.0.12.tgz
cd APC-3.0.12
phpize
./configure --enable-apc-mmap --with-apxs --with-php-config=/usr/bin/php-config
make
make install

6. EDIT: /etc/php.ini
extension=apc.so
apc.enabled=1
apc.shm_segments=1
apc.optimization=0
apc.shm_size=128
apc.ttl=7200
apc.user_ttl=7200
apc.num_files_hint=1024
apc.mmap_file_mask=/tmp/apc.XXXXXX
apc.enable_cli=1

7. RESTART:

apachectl configtest
apachectl restart

8. TEST:

make sure phpInfo shows php 5.1.4 apc is listed

9. INSTALL: new cybersource library
wget http://apps.cybersource.com/library/downloads/ 
cybersource_developer_kits/PHP/Linux/simapi-php-linux-5.0.1.tar.gz
cp php512_cybersource.so /usr/lib/php/modules/php512_cybersource.so

10. EDIT: /etc/php.ini
change this line:
   extension=php512_cybersource.so
to:
   extension=php503_cybersource.so

11. RESTART:

apachectl configtest
apachectl restart

12. TEST:

make sure there's no errors in the /var/log/httpd/error_log and test  
the store