Best place to define plugins' constants?

[mvlcek]

Another idea is: use only constants for default settings

I meant those default settings. A custom date format, things like that.

Also small plugins with no admin page, with just one or a few values to set up once.

In this case I suggest to use the following in your plugin:

Code:

if (!defined('myplugin_constant1')) define('myplugin_constant1', default_value);

The user can then define the constant in gsconfig.php, but if he doesn't, the default value is defined in the plugin itself.