RegisterModel::isValidEmail_invite PHP Method

    public function isValidEmail_invite($email, $old_email = null)
    {
        $res = preg_match($this->_email_reg, $email, $matches) !== 0;
        if (!$res) {
            $this->_error = L('PUBLIC_EMAIL_TIPS');
            // 无效的Email地址
        } elseif (!empty($this->_config['email_suffix'])) {
            $res = in_array($matches['1'], explode(',', $this->_config['email_suffix']));
            // !$res && $this->_error =L('PUBLIC_EMAIL_SUFFIX_FORBIDDEN');			// 邮箱后缀不允许注册
            !$res && ($this->_error = '该邮箱后缀不允许注册');
            // 邮箱后缀不允许注册
        }
        if ($res && $email != $old_email && $this->_user_model->where('`email`="' . mysql_escape_string($email) . '"')->find()) {
            $this->_error = L('PUBLIC_ACCOUNT_REGISTERED');
            // 该用户已注册
            $res = false;
        }
        return (bool) $res;
    }