captcha what is

Implementation of dynamic random verification code mechanism in PHPThe Verification Code (CAPTCHA) is the abbreviation for "Completely Automated public Turing test to tell Computers and humans Apart" (fully automated computer-and human-Turing test),

• Create a new PHP file captcha_code_file.php The code is as follows Copy Code Open Session FirstSession_Start ();Define foreground display verification code length & width$image _width = 120;$image _height =

First understand some of the functions in the parent class Verity.class.php (thinkphp/library/think/verity.class.php)1:check () Verify that the verification code is correct2:entry () output The verification code and save the value of the

This article illustrates the method used by Yii to use CAPTCHA authentication codes. Share to everyone for your reference, specific as follows: Detailed code can refer to: Yii from the sample Code post project, which has a contact table alone to

Topics Many automatedProgramThe form is automatically submitted, causing a large amount of junk data on the Internet. To prevent this situation, we have implemented a graphic Verification Code (CAPTCHA:Completely automated public Turing test to

This paper illustrates the use of CI frame Verification Code captcha auxiliary function, and share it for everyone's reference. Specifically as follows: Using the Captcha helper function is very convenient to generate the verification code, but the

In web development often use verification code, in order to prevent the registration of robots or malicious login and query, etc., the role should not be underestimated But the verification code is not a function can be done, it needs to generate

Since the company is renting virtual space and using an IIS server, there are a number of problems when deploying PHP: For example, we encountered this problem yesterday: Deploying the Thinkphp Project under IIS, the CAPTCHA cannot be

Laravel5.2 use Captcha to generate a verification code for Logon (session pitfall), laravel5.2captcha Recently, a friend asked me to help with laravel's verification code login, so I did a little research. (I forgot how to use laravel) First,

This paper describes the use of CI Framework Verification Code CAPTCHA auxiliary function, and share it for everyone's reference. Specific as follows: Using the Captcha helper function is convenient to generate verification code, but the picture

Project Introduction Project address: Poke around here. The reason for this project is that the great God wants to participate in the hackmit, need them to identify 10000 pieces in 15000 verification code or each character's recognition accuracy

PHP generates dynamic captcha GIF images, This is an example of a dynamic CAPTCHA image generated by PHP, and the point is that you can run it! The following first sent: Here are the related classes and functions that PHP needs to generate the

recently, a friend asked me to help get the Laravel verification code landing, so a little research. (I almost forgot how to use the Laravel) first of all, install laravel do not have to repeat, my version is 5.2.45 (note: laravel5.2.6 above the

Captcha (fully automatic distinction between computer and human Turing Test-completely Automated public Turing test to tell Computers and humans Apart) is commonly known as the authentication Code, is a public automatic program that distinguishes

In PHP to generate verification code picture is quite simple, because in PHP provides us with the graphics Gd.dll Library, to enable the GD graphics library we just put PHP-GD in front of the php.ini; Method One The code is as follows

PHP development framework YiiFramework tutorial (21) UI component custom Captcha example The Yii built-in Captcha can basically meet most of the requirements. if you have special requirements on the verification code, you can customize Captcha. It

#!/usr/bin/env python#coding=utf-8import randomimport Image, Imagedraw, Imagefont, imagefilter _letter_cases = " Abcdefghjkmnpqrstuvwxy "# lowercase letters, removing potentially disturbing i,l,o,z_upper_cases = _letter_cases.upper () # uppercase

#-*-Coding:utf-8-*-"""Created on Mon Mar 21 11:04:54 2017@author: SL"""Import requestsImport time################################################################################################ #先找到对应的爬取验证码连接, for example, I want to crawl the

Yii built-in CAPTCHA can basically meet most of the requirements, if you have special requirements for the verification code, you can customize the CAPTCHA, this is mainly through the expansion of ccaptchaaction to achieve, this example to customize

Code:Using System;Using System.Data;Using System.Configuration;Using System.Collections;Using System.Web;Using System.Web.Security;Using System.Web.UI;Using System.Web.UI.WebControls;Using System.Web.UI.WebControls.WebParts;Using