How i can pass the third parameter into the form validation callback function which is field name? - codeigniter

Question

here is the validation code :
public function registration () {
//
//
// -- code
$this->form_validation->set_rules('password', 'Password', 'required|callback__check_length[6,10]');
}
function _check_length($input, $min, $max)
{
$length = strlen($input);
if ($length <= $max && $length >= $min)
{
return TRUE;
}
elseif ($length < $min)
{
$this->form_validation->set_message('_check_length', 'Minimum number of characters is ' . $min);
return FALSE;
}
elseif ($length > $max)
{
$this->form_validation->set_message('_check_length', 'Maximum number of characters is ' . $max);
return FALSE;
}
}
it is giving me error :
Message: Missing argument 3 for Person::_check_length(), called in C:\wamp64\www\abc\system\libraries\Form_validation.php on line 744 and defined

Answer 1

You can do so by exploding the 2nd param. CI doesn't seem to support 3 params in function args for form validation rules:
public function _check_length($input, $minmax) {
$minmax = explode(',', $minmax);
$min = $minmax[0];
$max = $minmax[1];
$length = strlen($input);
if ($length <= $max && $length >= $min) {
return TRUE;
} elseif ($length < $min) {
$this->form_validation->set_message('_check_length', 'Minimum number of characters is ' . $min);
return FALSE;
} elseif ($length > $max) {
$this->form_validation->set_message('_check_length', 'Maximum number of characters is ' . $max);
return FALSE;
}
}
You also don't have to have your own function to do this. You can simply use min_length[x] and max_length[x] rules.
https://www.codeigniter.com/userguide3/libraries/form_validation.html#rule-reference