How to enable mysql support in PHP

[ATC]

PHP, Apache, mod_php and MySQL are all installed and working, but the mysql related commands in PHP do not function.

[ATC]

uncomment the line that enables the extension in your php.ini:

extension=mysql.so

if it don't work verify the line "extension_dir = /usr/lib/php4" and if the
file mysql.so is in this directory.

Note that Apache needs to be restarted after making changes to php.ini