Validation script

i am trying to validate a check box, but does not seem to get it to work.(though learning from a video for pop), i don’t know if the rule properties(like min , max, required) are standard or i can use any name like ‘ticked’. all other rule value works except for the check boc.

<?php 
require_once 'core/init.php';
if(Input::exists()){
//$accept = Input::get('accept');
//echo $accept;
//$accept=$_POST['accept'];
//echo $accept;
if (Token::check(Input::get('token')))
{

//Input::get('accept');

$validate = new Validate();
$validation = $validate->check($_POST, array(
		'fullname' => array(
				'required' => true),
		'username' => array(
				'required' => true,
				'min' => 2,
				'max' => 20,
				'unique' => 'reusers'),
		'password' => array(
				'required' => true,
				'min' => 6),
		'repeatpassword' => array(
				'required' => true,
				'matches' => 'password'),
		'email' => array(
				'required' => true,
				'unique' => 'reusers'),
		'houseno' => array(
				'required' => true),
		'addressa' => array(
				'required' => true),
		'addressc' => array(
				'required' => true),
		'county' => array(
				'required' => true),
		'country' => array(
				'required' => true),
		'telno' => array(
				'required' => true),
		'accept' => array(
				'ticked' => '1')
));

if($validation->passed()){

// insert in table
echo 'passed';

} else {
//output error
//print_r ($validation->errors());
foreach ($validation->errors() as $error) {
echo $error, '<br>';
					}
				}
			}
}
 ?>

this is the method

public function check($source, $items = array()) {
		foreach($items as $item => $rules) {
			foreach($rules as $rule => $rule_value) {
				
				$value = trim($source[$item]);

				if($rule === 'required' && $rule_value === true && empty($value)) {
					$this->addError("{$item} is required.");
				} else if (!empty($value)) {

					switch($rule) {
						case 'min':
							if(strlen($value) < $rule_value) {
								$this->addError("{$item} must be a minimum of {$rule_value} characters.");
							}
						break;
						case 'max':
							if(strlen($value) > $rule_value) {
								$this->addError("{$item} must be a maximum of {$rule_value} characters.");
							}
						break;
							case 'is_numeric':
							if(is_numeric($value) != $rule_value) {
								$this->addError("{$item} must be a numeric value.");
							}
						break;
						case 'matches':
							if($value != $source[$rule_value]) {
								$this->addError("{$rule_value} must match {$item}.");
							}
						break;
						case 'unique':
							$check = $this->_db->get('reusers', array($item, '=', $value));
							if($check->count()) {
								$this->addError("{$item} is already taken.");
							}
						break;
						case 'ticked':
							if($value != $rule_value) {
								$this->addError("{$item} must be a checked.");
							}
						break;
					}

				}

			}

this is the form part.

<div class='rl'>
	<input name="accept" type="checkbox" class="tickbox" value="1" />
	I agree to Reacheasy's<a href="termsandcondition.php">Terms and Conditions</a>
	</div>