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custom validation - callbacks

This is my extended class for form_validation:

class MY_Form_validation extends CI_Form_validation
    function __construct($config = array()) {
    function count_errors(){
        if (count($this->_error_array) === 0){
            return 0;
            return count($this->_error_array);

    public function max_number($num, $val) {
        if($num > $val){
            $this->set_message("max_number", "The %s can not be greater then "  . $val);
            return false;

    public function min_number($num, $val) {
        if($num < $val){
            $this->set_message("min_number", "The %s can not be smaller then "  . $num);
            return false;

    public function error_array(){
        return $this->_error_array;

And then in controller I set up rule like this for example "num" field:

$this->form_validation->set_rules('num', "Number", 'required|numeric|min_number[1]|max_number[99]');

For example 56 passes but also 1903.
But if num field is 0 it works.
So, this is working only for min_num but does not work for max_num.
What I am doing wrong here?

Try returning true if it passes. Is there a reason why you aren't just using the less_than, greater_than native rules?

Also your error message should say "than" instead of "then".

Well I need this, not less_than or greater_than. I need to write more complicated validation so I try with this to simple validation. Ok, I will try with true if passes.

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