> sudo apt-get update 
   > sudo apt-get install apache2

   > sudo apt-get install php5.6

   > sudo apt-get install postgresql
   > sudo apt-get install pgadmin3

   > sudo apt-get install mcrypt php5-mcrypt 
   > sudo php5enmod mcrypt 
   > sudo service apache2 restart

   > sudo apt-get install php5-gd
   > sudo service apache2 restart

https://www.digitalocean.com/community/questions/how-to-install-php-5-6-on-centos-7-0-x64

yum install php php-gd php-mysql php-mcrypt php-pgsql 

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