Yii2 Captcha uses Gregwar's Captcha library wrapper for Yii2.
Package is available on Packagist, you can install it using Composer.
composer require juliardi/yii2-captcha "*"or add to the require section of your composer.json file.
"juliardi/yii2-captcha": "*"This extension has 3 different steps. First is calling juliardi\captcha\CaptchaAction to provide CAPTCHA image - a way of preventing website spamming, then rendering CAPTCHA image in view with juliardi\captcha\Captcha, and validating user input against the generated CAPTCHA code with juliardi\captcha\CaptchaValidator.
Here is how to setup this extension for each step :
Add the following method into your Controller.
public function actions()
{
return [
'captcha' => [
'class' => \juliardi\captcha\CaptchaAction::class,
/**
* How many times should the same CAPTCHA be displayed. Defaults to 3.
* A value less than or equal to 0 means the test is unlimited (available since version 1.1.2).
*/
'testLimit' => 3, // int
/**
* The width of the generated CAPTCHA image. Defaults to 150.
*/
'width' => 150, // int
/**
* The height of the generated CAPTCHA image. Defaults to 40.
*/
'height' => 40, // int
/**
* The minimum & maximum length for randomly generated word. Defaults to [5, 7] | min 5 max 7.
*
* If an array is provided, the first value will be used as the minimum length and the second value will be used as the maximum length.
*
* **Note:** The minimum length must be at least 3 and the maximum length must be at most 20.
*
*/
'length' => [5, 7], // int|int[] | // Random word length will be between 5 and 7 characters
/**
* The quality of the generated JPEG image. Valid values are 1 - 100. Defaults to 80.
*/
'quality' => 80, // int
/**
* The fixed verification code. When this property is set,
*
* This is mainly used in automated tests where we want to be able to reproduce
* the same verification code each time we run the tests.
* If not set, it means the verification code will be randomly generated.
*/
// 'fixedVerifyCode' => 'testme', // string|null
],
];
}Add the following code to your view to render CAPTCHA image and input.
The following example shows how to use this widget with a model attribute:
use juliardi\captcha\Captcha;
echo Captcha::widget([
'model' => $model,
'attribute' => 'captcha',
// configure additional widget properties here
/**
* The route of the action that generates the CAPTCHA images.
* The action represented by this route must be an action of [[CaptchaAction]].
* Please refer to [[\yii\helpers\Url::toRoute()]] for acceptable formats.
*/
'captchaAction' => 'site/captcha', // string|array
/**
* HTML attributes to be applied to the CAPTCHA image tag.
* @see \yii\helpers\Html::renderTagAttributes() for details on how attributes are being rendered.
*/
'imageOptions' => [], // array
/**
* The template for arranging the CAPTCHA image tag and the text input tag.
* In this template, the token `{image}` will be replaced with the actual image tag,
* while `{input}` will be replaced with the text input tag.
*/
'template' => '{image} {input}', // string
/**
* HTML attributes for the input tag.
* @see \yii\helpers\Html::renderTagAttributes() for details on how attributes are being rendered.
*/
'options' => ['class' => 'form-control'], // array
]);The following example will use the name property instead:
use juliardi\captcha\Captcha;
echo Captcha::widget([
'name' => 'captcha',
]);You can also use this widget in an ActiveForm using the widget() method, for example like this:
<?= $form->field($model, 'captcha')->widget(\juliardi\captcha\Captcha::class, [
// configure additional widget properties here
]) ?>Add the following rule to your model to validate the captcha input :
use juliardi\captcha\CaptchaValidator;
public function rules()
{
return [
... some other rules...
['captcha', CaptchaValidator::class],
];
}