Yii2 core validator

Core Validators

Yii provides a series of commonly used core validators, mainly existing under the yiivalidators namespace. To avoid using lengthy class names, you can directly specify the corresponding core validator by nickname. For example, you can use the nickname 'required' to refer to the yiivalidatorsRequiredValidator class, such as:

<span style="color: #008080;">1</span> <span style="color: #0000ff;">public</span> <span style="color: #0000ff;">function</span><span style="color: #000000;"> rules()
</span><span style="color: #008080;">2</span> <span style="color: #000000;">{
</span><span style="color: #008080;">3</span>     <span style="color: #0000ff;">return</span><span style="color: #000000;"> [
</span><span style="color: #008080;">4</span>         [['email', 'password'], 'required'],
<span style="color: #008080;">5</span> <span style="color: #000000;">    ];
</span><span style="color: #008080;">6</span> }

yiivalidatorsValidator::builtInValidators attribute declares all supported validator nicknames.

<span style="color: #0000ff;">public</span> <span style="color: #0000ff;">static</span> <span style="color: #800080;">$builtInValidators</span> =<span style="color: #000000;"> [
        </span>'boolean' => 'yii\validators\BooleanValidator',
        'captcha' => 'yii\captcha\CaptchaValidator',
        'compare' => 'yii\validators\CompareValidator',
        'date' => 'yii\validators\DateValidator',
        'default' => 'yii\validators\DefaultValueValidator',
        'double' => 'yii\validators\NumberValidator',
        'each' => 'yii\validators\EachValidator',
        'email' => 'yii\validators\EmailValidator',
        'exist' => 'yii\validators\ExistValidator',
        'file' => 'yii\validators\FileValidator',
        'filter' => 'yii\validators\FilterValidator',
        'image' => 'yii\validators\ImageValidator',
        'in' => 'yii\validators\RangeValidator',
        'integer' =><span style="color: #000000;"> [
            </span>'class' => 'yii\validators\NumberValidator',
            'integerOnly' => <span style="color: #0000ff;">true</span>,<span style="color: #000000;">
        ]</span>,
        'match' => 'yii\validators\RegularExpressionValidator',
        'number' => 'yii\validators\NumberValidator',
        'required' => 'yii\validators\RequiredValidator',
        'safe' => 'yii\validators\SafeValidator',
        'string' => 'yii\validators\StringValidator',
        'trim' =><span style="color: #000000;"> [
            </span>'class' => 'yii\validators\FilterValidator',
            'filter' => 'trim',
            'skipOnArray' => <span style="color: #0000ff;">true</span>,<span style="color: #000000;">
        ]</span>,
        'unique' => 'yii\validators\UniqueValidator',
        'url' => 'yii\validators\UrlValidator',
        'ip' => 'yii\validators\IpValidator',<span style="color: #000000;">
    ];</span>

The main usage and properties of each validator are introduced in detail below.