Conflicts with Installing ever since I updated PHP

Question

Ever since I updated my php (Version 5.6.17), I can't install anything using yum for php (I have CENTOS), without there being a conflict. Any suggestions would be very helpful. It appears there is an older version somewhere I need to get rid of (5.3)

I experience this with both:

 sudo yum -y install php-gd

AND

sudo yum install php-mysql

This is the error

--> Running transaction check
---> Package php-gd.x86_64 0:5.3.3-40.el6_6 will be installed
--> Processing Dependency: php-common(x86-64) = 5.3.3-40.el6_6 for package: php-gd-5.3.3-40.el6_6.x86_64
--> Running transaction check
---> Package php-common.x86_64 0:5.3.3-40.el6_6 will be installed
--> Processing Conflict: php56w-common-5.6.17-1.w6.x86_64 conflicts php-common < 5.5.0
--> Finished Dependency Resolution
Error: php56w-common conflicts with php-common-5.3.3-40.el6_6.x86_64

I can't figure this out. Please don't mark as duplicate.

When I update with

Loaded plugins: fastestmirror, replace Setting up Update Process Loading mirror speeds from cached hostfile epel/metalink | 12 kB 00:00
* base: p3plmirror02.prod.phx3.secureserver.net * epel: mirror.sfo12.us.leaseweb.net * extras: p3plmirror02.prod.phx3.secureserver.net * remi-safe: mirrors.mediatemple.net * rpmforge: mirror.hmc.edu * updates: p3plmirror02.prod.phx3.secureserver.net base | 3.7 kB 00:00
extras | 3.4 kB 00:00
linuxtech | 2.6 kB 00:00
remi-safe | 2.9 kB 00:00
rpmforge | 1.9 kB 00:00
updates | 3.4 kB 00:00
No Packages marked for Update with:

 sudo yum install php56w-gd

I get:

Loaded plugins: fastestmirror, replace
Setting up Install Process
Loading mirror speeds from cached hostfile
epel/metalink                                                                                                                                                    |  12 kB     00:00     
 * base: p3plmirror02.prod.phx3.secureserver.net
* epel: mirror.sfo12.us.leaseweb.net
* extras: p3plmirror02.prod.phx3.secureserver.net
* remi-safe: mirrors.mediatemple.net
* rpmforge: mirror.hmc.edu
* updates: p3plmirror02.prod.phx3.secureserver.net
base       | 3.7 kB     00:00                                                                                                                                                           
extras     | 3.4 kB     00:00                                                                                                                                                   
linuxtech   | 2.6 kB     00:00                                                                                                                                                   
remi-safe   | 2.9 kB     00:00                                                                                                                                                       
rpmforge    | 1.9 kB     00:00                                                                                                                                                      
updates     | 3.4 kB     00:00                                                                                                                                                       
No package php56w-gd available.
Error: Nothing to do

Answer 1

Yum cannot find this package, because the repository is not enabled.

NOTICE: you should NOT enable both webtatic and remi repository as both provides conflicting packages.

BTW, as I see you already have "remi-safe", I rather recommend you to use "remi-php56" which provide more simple packages (same names than base packages), and more extensions.

See the Configuration Wizard

Answer 2

You apparently installed PHP 5.6 from Webtatic repository. I guess (i don't have the list of your installed packages, which you can get with yum list installed | grep php), that you need to install these packages with following command:

sudo yum install php56w-gd
sudo yum install php56w-mysql

and update your php with:

sudo yum update php56w

(in other words, always use php56w in place of php with all php-related packages)