Install PHP 5 on Centos 6

1) Add repos

// Install remi repos
$ rpm -Uvh http://download.fedoraproject.org/pub/epel/6/x86_64/epel-release-6-8.noarch.rpm
$ rpm -Uvh http://rpms.famillecollet.com/enterprise/remi-release-6.rpm

2) Install PHP and extensions

// Install PHP and other extensions:
$ yum --enablerepo=remi,remi-test install php php-devel php-gd php-mbstring php-mysqlnd php-pdo php-xml

// Install php-mcrypt
$ rpm -Uvh http://pkgs.repoforge.org/rpmforge-release/rpmforge-release-0.5.2-2.el6.rf.x86_64.rpm
$ yum --enablerepo=rpmforge install libmcrypt libmcrypt-devel
$ yum --enablerepo=remi,remi-test install php-mcrypt

3) Install php-fpm

// Install PHP-FPM
$ yum --enablerepo=remi,remi-test install php-fpm

// Run php-frpm when system starts
$ chkconfig --add php-fpm
$ chkconfig --levels 235 php-fpm on

// Start/stop php-fpm
$ /etc/init.d/php-fpm start
// or
$ service php-fpm start

4) Some PHP settings

$ sudo nano /etc/php.ini
  date.timezone = 'America/New_York'
  upload_max_filesize = 10M
  post_max_size = 10M

// Don't forget to restart php-fpm
$ service php-fpm restart