RegistrationForm::__construct PHP Method

    function __construct($site)
    {
        parent::__construct('frontend/pages/userRegister.tpl');
        // Validation checks for this form
        $this->addCheck(new FormValidatorCustom($this, 'username', 'required', 'user.register.form.usernameExists', array(DAORegistry::getDAO('UserDAO'), 'userExistsByUsername'), array(), true));
        $this->addCheck(new FormValidator($this, 'username', 'required', 'user.profile.form.usernameRequired'));
        $this->addCheck(new FormValidator($this, 'password', 'required', 'user.profile.form.passwordRequired'));
        $this->addCheck(new FormValidatorUsername($this, 'username', 'required', 'user.register.form.usernameAlphaNumeric'));
        $this->addCheck(new FormValidatorLength($this, 'password', 'required', 'user.register.form.passwordLengthRestriction', '>=', $site->getMinPasswordLength()));
        $this->addCheck(new FormValidatorCustom($this, 'password', 'required', 'user.register.form.passwordsDoNotMatch', create_function('$password,$form', 'return $password == $form->getData(\'password2\');'), array(&$this)));
        $this->addCheck(new FormValidator($this, 'firstName', 'required', 'user.profile.form.firstNameRequired'));
        $this->addCheck(new FormValidator($this, 'lastName', 'required', 'user.profile.form.lastNameRequired'));
        $this->addCheck(new FormValidator($this, 'country', 'required', 'user.profile.form.countryRequired'));
        // Email checks
        $this->addCheck(new FormValidatorEmail($this, 'email', 'required', 'user.profile.form.emailRequired'));
        $this->addCheck(new FormValidatorCustom($this, 'email', 'required', 'user.register.form.emailExists', array(DAORegistry::getDAO('UserDAO'), 'userExistsByEmail'), array(), true));
        $this->captchaEnabled = Config::getVar('captcha', 'captcha_on_register') && Config::getVar('captcha', 'recaptcha');
        if ($this->captchaEnabled) {
            $this->addCheck(new FormValidatorReCaptcha($this, Request::getRemoteAddr(), 'common.captcha.error.invalid-input-response'));
        }
        $authDao = DAORegistry::getDAO('AuthSourceDAO');
        $this->defaultAuth = $authDao->getDefaultPlugin();
        if (isset($this->defaultAuth)) {
            $this->addCheck(new FormValidatorCustom($this, 'username', 'required', 'user.register.form.usernameExists', create_function('$username,$form,$auth', 'return (!$auth->userExists($username) || $auth->authenticate($username, $form->getData(\'password\')));'), array(&$this, $this->defaultAuth)));
        }
        $this->addCheck(new FormValidatorPost($this));
        $this->addCheck(new FormValidatorCSRF($this));
    }