Yii2 Captcha Extension

Gregwar's Captcha library wrapper for Yii2.

Installation

The preferred way to install this extension is through composer. Either run

php composer.phar require --prefer-dist juliardi/yii2-captcha "*"

or add

"juliardi/yii2-captcha": "*"

to the require section of your composer.json file.

Usage

This extension has 3 different steps. First is calling CaptchaAction to generate CAPTCHA image, then rendering CAPTCHA image in view, and validating user input against the generated CAPTCHA code. Here is how to setup this extension for each step :

Action

Add the following method into your Controller.

public function actions()
{
    return [
        'captcha' => [
            'class' => 'juliardi\captcha\CaptchaAction',
            //'length' => 5, // captcha character count
            //'width' => 150, // width of generated captcha image
            //'height' => 40, // height of generated captcha image
            //'quality' => 100, // quality of generated captcha image
        ],
    ];
}

Some configurable attributes are :

• length An integer value to set the generated CAPTCHA character count
• width An integer value to set the width of generated CAPTCHA image
• height An integer value to set the height of generated CAPTCHA image
• quality An integer value to set the quality of generated CAPTCHA image

View file

Add the following code to your view to render CAPTCHA image and input.

use juliardi\captcha\Captcha;
...
<?php echo Captcha::widget([
    'model' => $model,
    'attribute' => 'captcha',
    //'captchaAction' => 'site/captcha',    // captcha action, default to site/captcha
    //'template' => '{image} {input}',      // template for rendering CAPTCHA image and input
    //'options' => [                        // HTML attribute for rendering text input
    //    'class' => 'form-control',
    //],
]) ?>

You can also use ActiveForm instance to render CAPTCHA input.

use juliardi\captcha\Captcha;
...
<?php echo $form->field($model, 'captcha')->widget(Captcha::className()) ?>

Some configurable attributes are :

• captchaAction Captcha action, default to site/captcha
• template Template for rendering CAPTCHA image and input. In this template, the token {image} will be replaced with the actual image tag, while {input} will be replaced with the text input tag.
• options the HTML attributes for the input tag.

Validation

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::className()],
    ];
}