Your PHP installation appears to be missing the MySQL extension which is required by WordPress.

Updated on September 3, 2017

While setting up wordpress 3.8, accessing through web browser, i ran into the following error:

Your PHP installation appears to be missing the MySQL extension which is required by WordPress.

This is caused due to either you do not have mysql installed or mysql installed but don’t have the php-mysql extension installed. So the quick solution to the above error is:

Make sure mysql and mysql-server is installed

Make sure both mysql and mysql-server is installed by issuing the following command:

[root@catest html]# yum install mysql mysql-server
Loaded plugins: fastestmirror, security
Loading mirror speeds from cached hostfile
Setting up Install Process
Package mysql-5.0.95-5.el5_9.x86_64 already installed and latest version
Package mysql-5.0.95-5.el5_9.i386 already installed and latest version
Package mysql-server-5.0.95-5.el5_9.x86_64 already installed and latest version
Nothing to do

Ensure PHP-MySQL component is installed

Ensure php53-mysql(becoz, php53 is installed) is installed using the below command:

[root@catest html]# yum info php53-mysql
Loaded plugins: fastestmirror, security
Loading mirror speeds from cached hostfile
Available Packages
Name : php53-mysql
Arch : x86_64
Version : 5.3.3
Release : 21.el5
Size : 94 k
Repo : centos
Summary : A module for PHP applications that use MySQL databases
URL : http://www.php.net/
License : PHP and LGPLv2 and LGPLv2+
Description: The php-mysql package contains a dynamic shared object that
: will add MySQL database support to PHP. MySQL is an
: object-relational database management system. PHP is an
: HTML-embeddable scripting language. If you need MySQL
: support for PHP applications, you will need to install this
: package and the php package.

If not, install it using the below command:

[root@catest html]# yum install php53-mysql
Loaded plugins: fastestmirror, security
Loading mirror speeds from cached hostfile
Setting up Install Process
Resolving Dependencies
--> Running transaction check
---> Package php53-mysql.x86_64 0:5.3.3-21.el5 set to be updated
--> Processing Dependency: php53-pdo for package: php53-mysql
--> Running transaction check
---> Package php53-pdo.x86_64 0:5.3.3-21.el5 set to be updated
--> Finished Dependency Resolution

Dependencies Resolved

=========================================================================
 Package           Arch         Version               Repository    Size
=========================================================================
Installing:
 php53-mysql       x86_64       5.3.3-21.el5          centos        94 k
Installing for dependencies:
 php53-pdo         x86_64       5.3.3-21.el5          centos        69 k

Transaction Summary
=========================================================================
Install       2 Package(s)
Upgrade       0 Package(s)

Total download size: 164 k
Is this ok [y/N]: y
Downloading Packages:
(1/2): php53-pdo-5.3.3-21.el5.x86_64.rpm          |  69 kB     00:00
(2/2): php53-mysql-5.3.3-21.el5.x86_64.rpm        |  94 kB     00:00
-------------------------------------------------------------------------
Total                                     74 kB/s | 164 kB     00:02
Running rpm_check_debug
Running Transaction Test
Finished Transaction Test
Transaction Test Succeeded
Running Transaction
  Installing     : php53-pdo                                         1/2
  Installing     : php53-mysql                                       2/2

Installed:
  php53-mysql.x86_64 0:5.3.3-21.el5

Dependency Installed:
  php53-pdo.x86_64 0:5.3.3-21.el5

Complete!

Verify accessing wordpress installation directory through browser

Wordpress installation page
WordPress installation page

 

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