_config.php


// Send form catpcha result
global $catpchaResult;
$catpchaResult = -1;




 ProductPage.php


class ProductPage_Controller extends Page_Controller {

    /* Init variable */
    public function initVariable() {

        // Using global variable to save catpcha result
        global $catpchaResult;

        // Genere random numbers
        $randomNumberOne = rand(0, 100);
        $randomNumberTwo = rand(0, 100);

        // Saving result
        $catpchaResult = ($randomNumberOne + $randomNumberTwo);

    }

    public function CreateForm() {
        global $catpchaResult;

        $this->initVariable();

        $form = Form::create(
            $this,
            __FUNCTION__,
            FieldList::create(
                TextField::create('Name',''),
                TextField::create('Surname',''),
                EmailField::create('Email',''),
                TextField::create('Address',''),
                TextField::create('Phone',''),
                TextField::create('Subject',''),
                TextareaField::create('Message',''),
                TextField::create('Captcha','')
            ),
            FieldList::create(
                FormAction::create('handleForm','Send Form')
                    ->setUseButtonTag(true)
                    ->addExtraClass('btn btn-default-color btn-lg')
            ),
            RequiredFields::create('Name','Email','Phone', 'Message')
        )->addExtraClass('form-style');

        foreach($form->Fields() as $field) {
            $field->addExtraClass('form-control')
                  ->setAttribute('placeholder', $field->getName().'*');

            if($field->getName() == 'Captcha'){ $field->setAttribute('placeholder', 'Result: '.$catpchaResult); }
        }

        $data = Session::get("FormData.{$form->getName()}.data");

        return $data ? $form->loadDataFrom($data) : $form;
    }

    public function handleForm($data, $form) {
        global $catpchaResult;

        Session::set("FormData.{$form->getName()}.data", $data);

        $commentForm = MyForm::create();
        $commentForm->ProductPageID = $this->ID;
        $form->saveInto($commentForm);
        $commentForm->write();

        echo 'Inserted number: ' . $commentForm->Captcha;       // Correct number
        echo 'Result ' . $catpchaResult;                        // Different number saved

        Session::clear("FormData.{$form->getName()}.data");
        $form->sessionMessage('Thanks for your interest','good');
    }

}