Backend Development
PHP Tutorial
PHP development framework Yii Framework tutorial (20) UI component Captcha example
PHP development framework Yii Framework tutorial (20) UI component Captcha example
Captcha (Completely Automated Public Turing test to tell Computers and Humans Apart, referred to as CAPTCHA), commonly known as verification code, is a public fully automatic program that distinguishes between computers and humans. In a CAPTCHA test, the computer as the server automatically generates a question for the user to answer. This question can be generated and judged by a computer, but only a human can answer it. Since computers cannot answer CAPTCHA questions, the user who answers the questions can be considered a human.
Yii Framework provides classes CCaptcha and CCaptchaAction to support verification codes. It should be noted that this function requires PHPGD extension support and can be queried through Yii's Requirements application:
If a Warning is displayed, you can turn on this function by installing the GD extension library and modifying PHP.ini.
CCaptcha also provides the method CCaptcha::checkRequirements() to detect whether the GD library is installed.
This example adds the Captcha function by modifying the Yii Framework Development Tutorial (16) UI component StarRating example. Only when the input verification code is correct, the user rating will be valid to avoid automatic scoring by the machine.
First, modify the DataModel, add an attribute verifyCode to store the verification code entered by the user, and add CCaptchaValidator verification to it.
class
DataModel extends CFormModel{public $rating;public $verifyCode;
public function rules(){
return array(array('rating,verifyCode', 'safe'),
array('verifyCode','captcha','allowEmpty'=>!CCaptcha::checkRequirements()),);
}}Then modify the SiteController and add the actions method. The Captcha component uses CCaptchaAction by default, and its default ID is captcha.
public function actions()
{
return array(
'captcha'=>array(
'class' => 'CCaptchaAction',
));
}Now you can add the Captcha component in the View:
beginWidget('CActiveForm'); ?> errorSummary($model); ?>widget('CStarRating', array('model'=>$model,'attribute'=>'rating','name'=>'rating','value'=>3,)); ?> label($model,'verifyCode') ?> widget('CCaptcha'); ?>textField($model,'verifyCode') ?> endWidget(); ?>
The above is the PHP development framework Yii Framework tutorial (20) UI component Captcha example Content, for more related content, please pay attention to the PHP Chinese website (www.php.cn)!
Hot AI Tools
Undresser.AI Undress
AI-powered app for creating realistic nude photos
AI Clothes Remover
Online AI tool for removing clothes from photos.
Undress AI Tool
Undress images for free
Clothoff.io
AI clothes remover
Video Face Swap
Swap faces in any video effortlessly with our completely free AI face swap tool!
Hot Article
Hot Tools
Notepad++7.3.1
Easy-to-use and free code editor
SublimeText3 Chinese version
Chinese version, very easy to use
Zend Studio 13.0.1
Powerful PHP integrated development environment
Dreamweaver CS6
Visual web development tools
SublimeText3 Mac version
God-level code editing software (SublimeText3)
Hot Topics
Microsoft NET Framework Installation Issues Error Code 0x800c0006 Fix
May 05, 2023 pm 04:01 PM
.NET Framework 4 is required by developers and end users to run the latest versions of applications on Windows. However, while downloading and installing .NET Framework 4, many users complained that the installer stopped midway, displaying the following error message - " .NET Framework 4 has not been installed because Download failed with error code 0x800c0006 ". If you are also experiencing it while installing .NETFramework4 on your device then you are at the right place
How to identify Windows upgrade issues using SetupDiag on Windows 11/10
Apr 17, 2023 am 10:07 AM
Whenever your Windows 11 or Windows 10 PC has an upgrade or update issue, you will usually see an error code indicating the actual reason behind the failure. However, sometimes confusion can arise when an upgrade or update fails without an error code being displayed. With handy error codes, you know exactly where the problem is so you can try to fix it. But since no error code appears, it becomes challenging to identify the issue and resolve it. This will take up a lot of your time to simply find out the reason behind the error. In this case, you can try using a dedicated tool called SetupDiag provided by Microsoft that helps you easily identify the real reason behind the error.
![SCNotification has stopped working [5 steps to fix it]](https://img.php.cn/upload/article/000/887/227/168433050522031.png?x-oss-process=image/resize,m_fill,h_207,w_330)
SCNotification has stopped working [5 steps to fix it]
May 17, 2023 pm 09:35 PM
As a Windows user, you are likely to encounter SCNotification has stopped working error every time you start your computer. SCNotification.exe is a Microsoft system notification file that crashes every time you start your PC due to permission errors and network failures. This error is also known by its problematic event name. So you might not see this as SCNotification having stopped working, but as bug clr20r3. In this article, we will explore all the steps you need to take to fix SCNotification has stopped working so that it doesn’t bother you again. What is SCNotification.e
Microsoft .NET Framework 4.5.2, 4.6, and 4.6.1 will end support in April 2022
Apr 17, 2023 pm 02:25 PM
Microsoft Windows users who have installed Microsoft.NET version 4.5.2, 4.6, or 4.6.1 must install a newer version of the Microsoft Framework if they want Microsoft to support the framework through future product updates. According to Microsoft, all three frameworks will cease support on April 26, 2022. After the support date ends, the product will not receive "security fixes or technical support." Most home devices are kept up to date through Windows updates. These devices already have newer versions of frameworks installed, such as .NET Framework 4.8. Devices that are not updating automatically may
How to use PHP framework Yii to develop a highly available cloud backup system
Jun 27, 2023 am 09:04 AM
With the continuous development of cloud computing technology, data backup has become something that every enterprise must do. In this context, it is particularly important to develop a highly available cloud backup system. The PHP framework Yii is a powerful framework that can help developers quickly build high-performance web applications. The following will introduce how to use the Yii framework to develop a highly available cloud backup system. Designing the database model In the Yii framework, the database model is a very important part. Because the data backup system requires a lot of tables and relationships
KB5012643 for Windows 11 breaks .NET Framework 3.5 apps
May 09, 2023 pm 01:07 PM
It's been a week since we talked about the new safe mode bug affecting users who installed KB5012643 for Windows 11. This pesky issue didn't appear on the list of known issues Microsoft posted on launch day, thus catching everyone by surprise. Well, just when you thought things couldn't get any worse, Microsoft drops another bomb for users who have installed this cumulative update. Windows 11 Build 22000.652 causes more problems So the tech company is warning Windows 11 users that they may experience problems launching and using some .NET Framework 3.5 applications. Sound familiar? But please don't be surprised
Symfony vs Yii2: Which framework is better for developing large-scale web applications?
Jun 19, 2023 am 10:57 AM
As the demand for web applications continues to grow, developers have more and more choices in choosing development frameworks. Symfony and Yii2 are two popular PHP frameworks. They both have powerful functions and performance, but when faced with the need to develop large-scale web applications, which framework is more suitable? Next we will conduct a comparative analysis of Symphony and Yii2 to help you make a better choice. Basic Overview Symphony is an open source web application framework written in PHP and is built on
How to use Yii3 framework in php?
May 31, 2023 pm 10:42 PM
As the Internet continues to develop, the demand for web application development is also getting higher and higher. For developers, developing applications requires a stable, efficient, and powerful framework, which can improve development efficiency. Yii is a leading high-performance PHP framework that provides rich features and good performance. Yii3 is the next generation version of the Yii framework, which further optimizes performance and code quality based on Yii2. In this article, we will introduce how to use Yii3 framework to develop PHP applications.
