# Class Phalcon\\Validation\\Validator\\Alnum
# Class **Phalcon\\Validation\\Validator\\Alnum**
*extends* abstract class [*Phalcon\\Validation\\Validator*](#)
*implements*[*Phalcon\\Validation\\ValidatorInterface*](#)
Check for alphanumeric character(s)
```
<pre class="calibre14">```
<?php
use Phalcon\Validation\Validator\Alnum as AlnumValidator;
$validator->add('username', new AlnumValidator(array(
'message' => ':field must contain only alphanumeric characters'
)));
```
```
### Methods
public **validate** (*unknown* $validation, *unknown* $field)
Executes the validation
public **\_\_construct** (\[*unknown* $options\]) inherited from Phalcon\\Validation\\Validator
Phalcon\\Validation\\Validator constructor
public **isSetOption** (*unknown* $key) inherited from Phalcon\\Validation\\Validator
Checks if an option is defined
public **hasOption** (*unknown* $key) inherited from Phalcon\\Validation\\Validator
Checks if an option is defined
public **getOption** (*unknown* $key, \[*unknown* $defaultValue\]) inherited from Phalcon\\Validation\\Validator
Returns an option in the validator's options Returns null if the option hasn't set
public **setOption** (*unknown* $key, *unknown* $value) inherited from Phalcon\\Validation\\Validator
Sets an option in the validator
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- [索引](# "总目录")
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- API参考
- API列表
- Abstract class Phalcon\Acl
- Abstract class Phalcon\Acl\Adapter
- Class Phalcon\Acl\Adapter\Memory
- Interface Phalcon\Acl\AdapterInterface
- Class Phalcon\Acl\Exception
- Class Phalcon\Acl\Resource
- Interface Phalcon\Acl\ResourceInterface
- Class Phalcon\Acl\Role
- Interface Phalcon\Acl\RoleInterface
- Class Phalcon\Annotations\Annotation
- Abstract class Phalcon\Annotations\Adapter
- Interface Phalcon\Annotations\AdapterInterface
- Class Phalcon\Annotations\Collection
- Class Phalcon\Annotations\Exception
- Class Phalcon\Annotations\Reader
- Interface Phalcon\Annotations\ReaderInterface
- Class Phalcon\Annotations\Reflection
- Class Phalcon\Assets\Collection
- Class Phalcon\Assets\Exception
- Interface Phalcon\Assets\FilterInterface
- Class Phalcon\Assets\Filters\Cssmin
- Class Phalcon\Assets\Filters\Jsmin
- Class Phalcon\Assets\Filters\None
- Class Phalcon\Assets\Inline
- Class Phalcon\Assets\Inline\Css
- Class Phalcon\Assets\Inline\Js
- Class Phalcon\Assets\Manager
- Class Phalcon\Assets\Resource
- Class Phalcon\Assets\Resource\Css
- Class Phalcon\Assets\Resource\Js
- Abstract class Phalcon\Cache\Backend
- Class Phalcon\Cache\Backend\Apc
- Class Phalcon\Cache\Backend\File
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- Interface Phalcon\Cache\BackendInterface
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- Class Phalcon\Cache\Frontend\Base64
- Class Phalcon\Cache\Frontend\Data
- Class Phalcon\Cache\Frontend\Igbinary
- Class Phalcon\Cache\Frontend\Json
- Class Phalcon\Cache\Frontend\None
- Class Phalcon\Cache\Frontend\Output
- Interface Phalcon\Cache\FrontendInterface
- Class Phalcon\Cache\Multiple
- Class Phalcon\Cli\Router\Route
- Class Phalcon\Config
- Class Phalcon\Config\Adapter\Ini
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- Interface Phalcon\Db\IndexInterface
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- Interface Phalcon\DispatcherInterface
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- Interface Phalcon\EscaperInterface
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- Interface Phalcon\Http\Response\CookiesInterface
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- Interface Phalcon\Mvc\Micro\CollectionInterface
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- Interface Phalcon\Mvc\Micro\MiddlewareInterface
- Abstract class Phalcon\Mvc\Model
- Abstract class Phalcon\Mvc\Model\Behavior
- Class Phalcon\Mvc\Model\Criteria
- Interface Phalcon\Mvc\Model\CriteriaInterface
- Class Phalcon\Mvc\Model\Exception
- Class Phalcon\Mvc\Model\Manager
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- Interface Phalcon\Mvc\Model\MessageInterface
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- Interface Phalcon\Mvc\Model\MetaDataInterface
- Class Phalcon\Mvc\Model\Query
- Interface Phalcon\Mvc\Model\QueryInterface
- Class Phalcon\Mvc\Model\Relation
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- Abstract class Phalcon\Mvc\Model\Resultset
- Abstract class Phalcon\Mvc\Model\Validator
- Interface Phalcon\Mvc\Model\ResultsetInterface
- Class Phalcon\Mvc\Model\Row
- Class Phalcon\Mvc\Model\Transaction
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- Class Phalcon\Mvc\Model\ValidationFailed
- Interface Phalcon\Mvc\ModelInterface
- Interface Phalcon\Mvc\ModuleDefinitionInterface
- Class Phalcon\Mvc\Router
- Class Phalcon\Mvc\Router\Annotations
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- Class Phalcon\Mvc\Router\Group
- Interface Phalcon\Mvc\Router\GroupInterface
- Class Phalcon\Mvc\Router\Route
- Interface Phalcon\Mvc\Router\RouteInterface
- Interface Phalcon\Mvc\RouterInterface
- Class Phalcon\Mvc\Url
- Class Phalcon\Mvc\Url\Exception
- Interface Phalcon\Mvc\UrlInterface
- Class Phalcon\Mvc\User\Component
- Class Phalcon\Mvc\User\Module
- Class Phalcon\Mvc\User\Plugin
- Class Phalcon\Mvc\View
- Abstract class Phalcon\Mvc\View\Engine
- Interface Phalcon\Mvc\View\EngineInterface
- Class Phalcon\Mvc\View\Exception
- Class Phalcon\Mvc\View\Simple
- Interface Phalcon\Mvc\ViewBaseInterface
- Interface Phalcon\Mvc\ViewInterface
- Abstract class Phalcon\Paginator\Adapter
- Class Phalcon\Paginator\Adapter\Model
- Class Phalcon\Paginator\Adapter\NativeArray
- Class Phalcon\Paginator\Adapter\QueryBuilder
- Interface Phalcon\Paginator\AdapterInterface
- Class Phalcon\Paginator\Exception
- Class Phalcon\Queue\Beanstalk
- Class Phalcon\Queue\Beanstalk\Job
- Final class Phalcon\Registry
- Class Phalcon\Security
- Class Phalcon\Security\Exception
- Abstract class Phalcon\Session
- Abstract class Phalcon\Session\Adapter
- Interface Phalcon\Session\AdapterInterface
- Class Phalcon\Session\Bag
- Interface Phalcon\Session\BagInterface
- Class Phalcon\Session\Exception
- Class Phalcon\Tag
- Class Phalcon\Tag\Exception
- Abstract class Phalcon\Tag\Select
- Abstract class Phalcon\Text
- Abstract class Phalcon\Translate
- Abstract class Phalcon\Translate\Adapter
- Class Phalcon\Translate\Adapter\Csv
- Class Phalcon\Translate\Adapter\Gettext
- Class Phalcon\Translate\Adapter\NativeArray
- Interface Phalcon\Translate\AdapterInterface
- Class Phalcon\Translate\Exception
- Class Phalcon\Validation
- Class Phalcon\Validation\Exception
- Class Phalcon\Validation\Message
- Class Phalcon\Validation\Message\Group
- Interface Phalcon\Validation\MessageInterface
- Abstract class Phalcon\Validation\Validator
- Class Phalcon\Validation\Validator\Alnum
- Class Phalcon\Validation\Validator\Alpha
- Class Phalcon\Validation\Validator\Between
- Class Phalcon\Validation\Validator\Confirmation
- Class Phalcon\Validation\Validator\Digit
- Class Phalcon\Validation\Validator\Email
- Class Phalcon\Validation\Validator\ExclusionIn
- Class Phalcon\Validation\Validator\File
- Class Phalcon\Validation\Validator\Identical
- Class Phalcon\Validation\Validator\InclusionIn
- Class Phalcon\Validation\Validator\Numericality
- Class Phalcon\Validation\Validator\PresenceOf
- Class Phalcon\Validation\Validator\Regex
- Class Phalcon\Validation\Validator\StringLength
- Class Phalcon\Validation\Validator\Uniqueness
- Class Phalcon\Validation\Validator\Url
- Interface Phalcon\Validation\ValidatorInterface
- Class Phalcon\Version
- 参考手册
- 安装（Installation）
- 教程 1：让我们通过例子来学习（Tutorial 1: Let’s learn by example）
- 教程 2：Introducing INVO（Tutorial 2: Introducing INVO）
- 教程 3: Securing INVO
- 教程 4: Using CRUDs
- 教程 5: Customizing INVO
- 教程 6: Vkuró
- 教程 7：创建简单的 REST API（Tutorial 7: Creating a Simple REST API）
- 示例列表（List of examples）
- 依赖注入与服务定位器（Dependency Injection/Service Location）
- MVC 架构（The MVC Architecture）
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- 使用模型（Working with Models）
- 模型元数据（Models Meta-Data）
- 事务管理（Model Transactions）
- Phalcon 查询语言（Phalcon Query Language (PHQL)）
- 缓存对象关系映射（Caching in the ORM）
- 对象文档映射 ODM (Object-Document Mapper)
- 使用视图（Using Views）
- 视图助手（View Helpers）
- 资源文件管理（Assets Management）
- Volt 模版引擎（Volt: Template Engine）
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- 安全（Security）
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- 多语言支持（Multi-lingual Support）
- Universal Class Loader
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- 数据库抽象层（Database Abstraction Layer）
- 国际化（Internationalization）
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- Phalcon 开发工具（Phalcon Developer Tools）
- 提高性能：下一步该做什么？（Increasing Performance: What’s next?）
- 单元测试（Unit testing）
- 授权（License）