PHP Fatal error: Call to undefined function mysql_connect()

En servidores linux cuando nos falta la librería de PHP para enlazar con las bases de datos MySQL nos devuelve el siguiente error:

PHP Fatal error:  Call to undefined function mysql_connect()

Para resolverlo tenemos que instalar la librería php-mysql, por ejemplo en CentOS lo podemos hacer con yum:

> yum install php-mysql
Loaded plugins: fastestmirror, security
Loading mirror speeds from cached hostfile
 * base:
 * extras:
 * updates:
Setting up Install Process
Resolving Dependencies
--> Running transaction check
---> Package php-mysql.i386 0:5.1.6-39.el5_8 set to be updated
--> Processing Dependency: php-pdo for package: php-mysql
--> Running transaction check
---> Package php-pdo.i386 0:5.1.6-39.el5_8 set to be updated
--> Finished Dependency Resolution

Dependencies Resolved

 Package                    Arch                  Version                          Repository             Size
 php-mysql                  i386                  5.1.6-39.el5_8                   base                   87 k
Installing for dependencies:
 php-pdo                    i386                  5.1.6-39.el5_8                   base                   66 k

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

Total download size: 153 k
Is this ok [y/N]: y
Downloading Packages:
(1/2): php-pdo-5.1.6-39.el5_8.i386.rpm                                                  |  66 kB     00:03
(2/2): php-mysql-5.1.6-39.el5_8.i386.rpm                                                |  87 kB     00:00
Total                                                                           29 kB/s | 153 kB     00:05
Running rpm_check_debug
Running Transaction Test
Finished Transaction Test
Transaction Test Succeeded
Running Transaction
  Installing     : php-pdo                                                                                 1/2
  Installing     : php-mysql                                                                               2/2

  php-mysql.i386 0:5.1.6-39.el5_8

Dependency Installed:
  php-pdo.i386 0:5.1.6-39.el5_8

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