Pop\Form\Form::clear PHP Method

    public function clear()
    {
        // Start a session.
        if (session_id() == '') {
            session_start();
        }
        if (isset($_SESSION['pop_csrf'])) {
            unset($_SESSION['pop_csrf']);
        }
        if (isset($_SESSION['pop_captcha'])) {
            unset($_SESSION['pop_captcha']);
        }
        return $this;
    }

<?php

require_once '../../bootstrap.php';
use Pop\Form\Form;
use Pop\Validator;
try {
    $fields = array('username' => array('type' => 'text', 'label' => 'Username:'******'required' => true, 'attributes' => array('size' => 40), 'validators' => new Validator\AlphaNumeric()), 'password' => array('type' => 'password', 'label' => 'Password:'******'required' => true, 'attributes' => array('size' => 40)), 'my_captcha' => array('type' => 'captcha', 'label' => 'Please Solve: ', 'attributes' => array('size' => 10), 'expire' => 120), 'submit' => array('type' => 'submit', 'value' => 'SUBMIT'));
    $form = new Form($_SERVER['PHP_SELF'], 'post', $fields, '    ');
    if ($_POST) {
        $form->setFieldValues($_POST, array('strip_tags' => null, 'htmlentities' => array(ENT_QUOTES, 'UTF-8')));
        if (!$form->isValid()) {
            $form->render();
        } else {
            // Option to clear out and reset security token
            $form->clear();
            echo 'Form is valid.<br />' . PHP_EOL;
            print_r($form->getFields());
        }
    } else {
        $form->render();
    }
    echo PHP_EOL . PHP_EOL;
} catch (\Exception $e) {
    echo $e->getMessage() . PHP_EOL . PHP_EOL;
}