why need captcha

Zend-based Captcha mechanism. How do I generate a verification code image? Use php GD? OK, right. In fact, the Zend Captcha module has been encapsulated. This article describes how to use the Zend Captcha module. How does one generate a verification

in the process of Web development , Verification code is often used to prevent the robot from constantly submitting data and causing the website to be paralyzed . Yii provides a verification code plug- in, that is , Captcha. The first step:using in

Example of Captcha Verification Code implemented by php, captcha Verification Code This example describes the Captcha Verification Code class implemented by php, which is widely used in php programming. Share it with you for your reference. The

Why can someone else use the verification code? Why can someone else use the verification code? The following is the code for obtaining the verification code. is the verification code too simple? how can we make it more complicated? /** *

First, describe the cause of the error: An exception is thrown when the spring Security interceptor is used to verify the verification code.Throw new runtimeexception ("CAPTCHA validation failed due to exception", CSE );After the front-end submits

Why do I need to enable two-step verification for an Apple ID? Why should I use two-step verification for my Apple ID?Apple ID is the key for you to perform many Apple-related tasks. Please note that only you can access your account details, update

12306 automatic ticket placement-Logon, 12306 ticket placement 12306 after the website launches the image verification code, it puts forward higher requirements for the ticketing software. This article does not involve automatic identification

I want to sum up the verification code (the verification code used for open source. Of course, you can also implement it on your own, but you can use it for mature open-source projects.) After reading several open-source projects, we found that

What is the website Verification Code generally placed on the server? Why? Are the website verification codes of javaphp.net stored in the same place? What is the website Verification Code generally placed on the server? Why? Are website

Apache Shiro is a powerful and easy-to-integrate open-source rights framework that enables authentication, authorization, encryption, session management, and more. Authentication and authorization are the core of authority control, simply,