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How to fix Fatal error: Call to undefined function: mysql_connect() in Ubuntu

When I use a PHP connection to test my web server, I get this error:

Fatal error: Call to undefined function: mysql_connect()

This is because php5-mysql is not installed. Here is the solution:

Step 1 Install php5-mysql

      sudo apt-get install php5-mysql

Step 2 Reconfigure php5-mysql

      sudo dpkg-reconfigure php5-mysql

Step 3 Restart mysqld

      sudo /etc/init.d/mysql restart

After these 3 steps, I can connect to the database via my web server!

[Reference]:

http://www.go2linux.org/Fatal-error-Call-to-undefined-function-mysql_connect