http://www.shayanderson.com/linux/centos-5-or-centos-6-upgrade-php-to-php-54-or-php-55.htm https://webtatic.com/packages/php55/

This article describes how to upgrade to PHP 5.4 or PHP 5.5 on a CentOS 5 or CentOS 6 server.

1. First, detect if any PHP packages are installed:
   # yum list installed | grep php
   

2. If packages are installed remove them, for example:
   # yum remove php.x86_64 php-cli.x86_64 php-common.x86_64 php-gd.x86_64 php-ldap.x86_64 php-mbstring.x86_64 php-mcrypt.x86_64 php-mysql.x86_64 php-pdo.x86_64
   

3. Add PHP 5.4 packages to yum using this command 
   for CentOS 5.x
   # rpm -Uvh http://mirror.webtatic.com/yum/el5/latest.rpm
   

   for CentOS 6.x:
   

   # rpm -Uvh http://mirror.webtatic.com/yum/el6/latest.rpm

   Now, you can check if the new PHP (5.4: php54w or 5.5: php55w) packages are available:
   

   # yum list available | grep php

   Or, version specific search:
   

   # yum list available | grep php54

4. Next, install the new PHP 5.4 or 5.5 packages, for example when installing PHP 5.4 packages I used:
   # yum install php54w.x86_64 php54w-cli.x86_64 php54w-common.x86_64 php54w-gd.x86_64 php54w-ldap.x86_64 php54w-mbstring.x86_64 php54w-mcrypt.x86_64 php54w-mysql.x86_64 php54w-pdo.x86_64
   

5. PHP should now be upgraded to the new version, you can verify with the command:
   # php -v
   

   PHP 5.4.17 (cli) (built: Jul 23 2013 00:02:04) Copyright (c) 1997-2013 The PHP Group Zend Engine v2.4.0, Copyright (c) 1998-2013 Zend Technologies Finally, restart the Web server: # service httpd restart

Finally, restart the Web server:

# service httpd restart

You can confirm that mysqli is installed, or not, by listing the installed modules. SSH into your Cent OS box, and issue the following command*

php -m | grep mysqli

If nothing is returned, then you do not have mysqli.so loaded. Check if you have the shared object is installed on you system.

# Located extension dir
php -i | grep extension_dir
# List mysql.so in the path returned from the previous command
ls -la /usr/lib/php/extensions/no-debug-non-zts-20090626/mysqli.so

If the mysqli.so is present, and has the permissions -rwxr-x-rx, you'll need to load/enable the mysqli extension in the systems global php.ini file.

# Adjust path to correct php.ini file. 
# Run `php -i | grep "Configuration File"` to locate, if needed
# It might be easier to use vi, or nano, for this
sudo echo "extension=mysqli.so" >> /etc/php5/php.ini
# Restart apache
sudo service httpd restart

Else. If you do not have mysqli.so present in your system. You can install the rpm by following your systems package manager, and repeating the previous php.ini step.

sudo yum install php5-mysqli

Something with yum

How to clear the yum cache: When a package is downloaded, installed and is removed there is a chance that the package may still be saved/stored in the yum?s cache. So to clean all the cached packages from the enabled repository cache directory, login as root and execute the following:

To purge the old package information completely, execute the following command:

To clean any cached xml metadata from any enabled repository, execute the following

If you wish to clean all the cached files from any enabled repository at once, execute the

Following command:

Vietnamese stupid version http://dim.vn/tin-tuc/460-huong-dan-cai-dat-memcached-day-du-tren-centos-6.html

Finx System hardware information http://www.cyberciti.biz/faq/linux-command-to-find-the-system-configuration-and-hardware-information/ http://www.cyberciti.biz/faq/linux-display-information-about-installed-hardware/