captcha what is

PHP Verification Code implementation codes (3 kinds), PHP captcha Code of 3 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

Want to save the captcha image on someone else's website, or display the same captcha image on my website. As a result, the verification code on his website is What the hell is this? How to save this verification code locally, or refer to this image.

Refreshing the browser is normal. How to solve, what code can force the verification code re-loaded. Reply to discussion (solution) Add a js random parameter after the generated address, url?r=math.random () "> You add a non-cached header

The problem with my PHP captcha is this: Image corrupt or Truncated:http://localhost/htsys/?c=login&m=yzm No matter how I debug always can not display the captcha picture, prompting the image for its own reasons can not be displayed ... Tangled Up

Recently encountered a problem, is that the verification code on someone else's computer can be displayed, but my own computer up can't. Reason for a long time, haha, finally found! Now let's share:Program:$w = 80; Set picture width and height$h = 26

Note that spring MVC is implemented through annotation. If you want to know how to use spring annotation, go somewhere else, or I will write a new article later! Prerequisites: the jar package kaptcha-2.3.2.jar is required as

First make sure that the php.ini setting has not opened GD extension function, test for examplePrint_r (Gd_info ());Assuming there is a printout of the content, such as the following, the GD feature is open:Array ( [GD Version] = bundled (2.0.34

public class Authimg extends HttpServlet {/****/Private static final long serialversionuid = 4975974534946437434L;Set the font and size of the graphics Captcha stringPrivate font mfont = new Font ("Microsoft Jas Black", Font.Italic, 18);Private

maven reference ${jfinal-captcha.version} replaced with the corresponding version such as: 0.1 Cn.dreampie jfinal-captcha ${ Jfinal-captcha.version} /** * Get the Verification code */@ResponseBody @RequestMapping (value = "Captcha", produces =

Many of the online analog login procedures, mostly through the service program, such as Apache operation, get to the verification code displayed on the Web page, and then fill in the post out, so although it looks very friendly, but since the analog

Copy CodeThe code is as follows: function Make_rand ($length = "32") {//Captcha text generation functions $str = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890"; $result = ""; for ($i =0; $i $num [$i]=rand (0,61); $result. = $str [$

PHP generated Verification code file is a learning PHP friends should know the technology oh, this can not only make your site security to improve some, you can also note some machine registration and other problems Oh, below we will look at a

Generate Random Verification code PackageCom.web;//Validation code Generation processing

PHP generates a CAPTCHA image, PhpHeader(' Content-type:image/png ');$image=imagecreatetruecolor (100, 30);$color=imagecolorallocate ($image, 255, 255, 255); Imagefill ($image, 20, 20,$color);Contains only numbers//For ($i =0; $i containing

PHP Verification Code, PHP captcha code Design a verification code class that can be called at any time when needed Verification code class, Save as ValidateCode.class.php 1 Php2 //Verification Code Class3 Session_Start();4 classValidatecode {5

Packageweb;ImportJava.awt.Color;ImportJava.awt.Font;ImportJava.awt.Graphics2D;ImportJava.awt.image.BufferedImage;Importjava.io.IOException;ImportJava.util.Random;ImportJavax.imageio.ImageIO;Importjavax.servlet.ServletException;ImportJavax.servlet.Ser

Recently encountered a problem, is that the verification code on someone else's computer can be displayed, but my own computer up can't. Reason for a long time, haha, finally found! Now let's share:Program: $w = 80; Set picture width and height$h = 2

(This article also published in my public number "dotnet daily Essence article", Welcome to the right QR code to pay attention to. ) Preface: Since ASP. NET 5 and MVC 6 are a new Web development platform for Microsoft, some of the existing code

Many of the online simulation login programs, mostly through the service program Apache and other operations, get to the verification code displayed on the Web page, and then fill in and then post out, although it looks very friendly, but since the

How to change the size of PHP captcha font [color= #0000FF] This verification code picture shows the number is too small, how to change the size of the font in the following code, the number becomes larger [/color] Generate a Captcha