[Opserty]

Well then but the contents of mycustom_check directly inside the string instead, does that not work?
like:

PHP Code:

$string = 
' /* Do some long check */
 if($data != "something")
 {
     /*$this->error("You cant do this or something()*/
 }
 else
 {
     return true;
 }

';
$this->validfields['fieldname'] = array(TYPE_STR, REQ_NO, $string); 


Does that not work? Does it generate errors or something? Have you test your validation code independently to ensure that it works in the first place?

Or:

PHP Code:

function mycustom_check($data)
{
    // Some long code here
    // ....
    // ....
    // ....
    // return true/false
}

$this->validfields['fieldname'] = array(TYPE_STR, REQ_NO, 'if(!mycustom_check($data)) { $this->error("Some error message!");} '); 


How about that? (If you only need to use the error method).

What are you checking for/validating for? Is there not already a validation method in the Base Datamanager?