phpweb会员模块

// 生成验证码
function generateCaptcha() {
    $captcha = rand(1000, 9999);
    $_SESSION['captcha'] = $captcha;
    // 输出验证码图片
    // ...
}

// 验证验证码
function verifyCaptcha($input) {
    if (isset($_SESSION['captcha']) && $_SESSION['captcha'] == $input) {
        return true;
    }
    return false;
}

// 检查用户权限
function checkPermission($user_id, $permission) {
    // 查询数据库获取用户权限
    $user_permissions = getUserPermissions($user_id);
    if (in_array($permission, $user_permissions)) {
        return true;
    }
    return false;
}

// 更新用户积分
function updatePoints($user_id, $points) {
    // 查询当前积分
    $current_points = getUserPoints($user_id);
    $new_points = $current_points + $points;
    // 更新数据库
    updatePointsInDB($user_id, $new_points);
}