Custom validation error messages per rule

[eluser]xwero[/eluser]
Now you are talking about an better/easier way to set custom messages. I would even push it further and reserve the first parameter of every rule, even callbacks for a custom message.

Code:

$rules['field1'] = 'max_length[,100]'; // no custom message
$rules['field2'] = 'max_length[custom_msg,100]';
$rules['field3'] = 'required'; // no param no square brackets
$rules['field4'] = 'required[custom_msg]';
$rules['field3'] = 'callback_method[custom_msg]';
$rules['field4'] = 'callback_method[custom_msg,more,params]';

The custom_msg in the examples are the line keys.

This is possible because the rule is split from the params before the rule is called.