captcha what is

[Php]/*** Image Verification Code* An Image verification code is generated. The verification code contains numbers and uppercase letters. The md5 encrypted verification code is stored in the session.** Usage:* $ Captcha = new Catpcha ();* $ Captcha->

In CI, the verification class can be done in this way. First, the practices in the manual are given. Attach auxiliary functionsUse the following code to load the verification code auxiliary function: $ This-> load-> helper ('captcha '); The

CAPTCHA function 1. Installing the CAPTCHA Plugin(Dj_login) D:\dj\dj_login>pip Install django-simple-captchacollecting django-simple-captcha Using cached https:// files.pythonhosted.org/packages/d7/f4/ea95b04ed3abc7bf225716f17e35c5a185f6100db4d7541a4

The role of the CAPTCHA:1, to prevent advertising machine registration and posting, comments.2, to prevent brute force password, especially the password with administrator privileges.Here is a very useful verification code generation tool:

Implement the ajax pop-up window login function in ECSHOP and ecshopajax pop-up window Login In the previous article, we introduced how to use the openSpeDiv method to implement the Ecshop logon window. Click here for reference. The following

This article mainly introduces the operations related to cookie and session functions in PHP Yii Framework. For more information, see Sessions Similar to requests and responses, you can access sessions by default by using the Session application

When generating a form from a form widget at the view level, field can only exist in the database, for example: use yii\helpers\html; Use Yii\widgets\activeform; Use Yii\captcha\captcha; ' Sign-form ', ' Options ' =>[' action ' = '

When logging on to many websites, they no longer use simple English and digital verification codes. In order to prevent attacks by disgusting registration and group-sending software, they are now using Chinese verification codes.Today, we will share

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

Verification code in the form implementation more and more, but with JS write verification code, always feel inconvenient, so learned the next PHP implementation of the verification code. Well, there is nothing to do, but do not want to waste time,

Article Walker link: http://www.cnblogs.com/rgbw/archive/2012/12/26/2834567.htmlVerification Code of yesterday, today and tomorrowWhy use a verification codeWithout a verification code, an attacker would use unwanted programs to automatically

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

The session cannot be passed, files can be saved, and mysql cannot save the verification code in the session. when files is used to save the session, the user can read the verification code in the background $ _ SESSION ['captcha '] during

Sessions Similar to requests and responses, the default is to access sessions by using the session application component for the Yii\web\session instance. Open and Close Sessions You can use the following code to turn the session on and off.

1.spring configuration file Applicationcontext.xml yes 105,179,90 blue 125 45 45 code 4 Arial, Italic, Microsoft Black 2. Controller implementation

This article mainly introduced the Django through the Ajax to complete the mailbox user registration, activates the account the method, now shares to everybody, also gives everybody to make a reference. Come and see it together. First, the image

In LaravelThere are a lot of picture verification code in the library can be used, this chapter introduces its LaravelOne: Gregwar/captcha, this library is relatively simple, in Laravelare more commonly used. Below we will introduce the following

Arbitrary ECSHOP Front-End User LoginArbitrary user logon to the website due to code design defects. File: flow. php starts at line 1 Elseif ($ _ REQUEST ['step'] = 'login') {include_once ('AGES /'. $ _ CFG ['lang ']. '/user. php ');/** User Login

Recently read a Yii tutorial video, is in accordance with the version of 1.1, I want to use Yii2.0 framework also refer to his study development, the results found a lot of different, now talk about the verification code thingFirst add an action to

1. First create a verification class CAPTCHA Public class CAPTCHA{Private string text;Private int width;Private int height;Private string familyname;Private bitmap image;Private Static random = new random (); Public String familyname{Get {return