CodeIgniter helpful hints

[eluser]xwero[/eluser]
One more hint (inspired by this thread):

Instead of hardcoding the fieldnames in the callback function, make use of the parameter to identify the fields

Code:

$rules['field1'] = 'callback_rule[field2,field3]';

function rule($str,$param)
{
    list($post1,$post2) = explode(',',$param);
    $post1val = $this->input->post($post1);
    $post2val = $this->input->post($post2);
    if(!$post1val OR !$post2val)
    {
       return FALSE;
    }

    if(strcasecmp($str,$post1val) < 0 OR strcasecmp($str,$post1val) < 0)
    {
       return FALSE;
    }

    return TRUE
}

If the fieldnames change you can change them in the rule instead of in the callback function and if you use the function for multiple sites/apps you can add it to an extended Validation library (MY_Validation).