[kh99]

What you have is probably the best way to keep invalid values from being saved. The PHP Validation code will allow you to check a value and print a message under it if it's invalid, but it will still be saved (maybe you knew that already and that's why you created the thread).

What you might be able to do in your plugin is print an error message then redirect back to the option page like:

PHP Code:

define('CP_REDIRECT', 'options.php?do=options&dogroup=' . $vbulletin->GPC['grouptitle']);
print_stop_message('error_phrase', $vbulletin->GPC['title']); 


(You'd want to use a real error phrase name, but I'm not sure of the other parameters you'd want). I don't think there's any easy way to get the error message to display under the value unless you let it save the invalid values (that is a reasonable option - you could check the values the mod code and use defaults if they're invalid, put in PHP validation code for your fields, and then whenever someone goes to the adminCP they'll see the error message).