Article Introduction：This article introduces in detail the PHP verification code class based on the GD library (supports Chinese and English fonts, backgrounds, interference points and lines, distortion...), which has certain reference value. Let's take a look at it together.

2017-07-15 comment 0  1022

Article Introduction：PHP verification code production is an assessment of the basic skills of PHP. PHP verification code production must open the gd library, because many functions in the gd library are used.

2019-09-27 comment 0  3265

Article Introduction：PHP verification code production is an assessment of PHP basic skills. PHP verification code production must open the gd library because it requires the use of many functions in the gd library.

2017-08-03 comment 0  2312

Article Introduction：PHP verification code implementation steps: generate base image (depends on PHP image processing library GD); generate verification content (generate random numbers, use PHP function rand()); generate verification code image; verify verification content (requires PHP SESSION basic operation, Save verification content on the server side; front-end Ajax basics).

2019-09-16 comment 0  6611

Article Introduction：How to use PHP to strengthen the security of verification code and anti-bot technology In today's Internet era, verification code and anti-bot technology are widely used in various websites and applications to ensure user security and data confidentiality. As a widely used server-side scripting language, PHP has powerful and flexible functions that can effectively implement verification codes and anti-bot technology. 1. Use the GD library to generate verification code images. The GD library is an extension library of PHP that can be used to generate verification code images. By using the GD library, we can easily

2023-06-29 comment 0  1226

Article Introduction：PHP image processing image background and canvas operations. Picture background and canvas operations of PHP image processing, such as verification codes or generating statistical icons based on dynamic data, as well as some GD library operations introduced earlier, are all dynamically drawn images. And in

2016-07-13 comment 0  990

Article Introduction：The method of drawing the five-star red flag in php is based on the GD library and the five-star red flag in the phpgd library. How to draw the five-star red flag in php based on the GD library, phpgd library five-star red flag This example describes how to draw the five-star red flag in php based on the GD library. Share it with everyone for your reference. The specific analysis is as follows: This

2016-07-13 comment 0  1000

Article Introduction：Getting Started with PHP and the GD Library: How to Create a Captcha Verification System Captcha is a technique used to verify that a user is a real human being. It is widely used in websites and applications to prevent abuse and attacks by automated scripts and bots. This article will introduce how to create a simple verification code verification system using PHP and the GD library. The GD library is a PHP extension library for processing images. It provides some powerful image processing tools, including generating images, manipulating image pixels, and creating verification codes. Before we begin, we need to make sure

2023-07-15 comment 0  846

Article Introduction：After doing development for such a long time, I have been very troubled by verification issues. I keep writing a lot of repetitive code, which is quite painful for me who wants to be lazy.

2016-05-16 comment 0  934

Article Introduction：How to create a dynamic image verification code using PHP and GD library In web applications, in order to prevent bots and malicious attackers from automating operations, verification codes are often used, requiring users to enter a verification code to confirm their identity. By using PHP and GD library, we can easily create dynamic image verification codes. The GD library is an extension library for PHP that provides some functions for processing images. In this article, we will use the functions of the GD library to generate an image containing random characters and present it to the user as a verification code. No.

2023-07-12 comment 0  944

Article Introduction：Detailed steps for generating verification code images using PHP and GD libraries Verification codes are a commonly used security verification mechanism that can be used to prevent malicious programs or robot automation. Automated attacks can be effectively prevented by generating a random image that requires users to enter the verification code shown in the image when logging in or registering. In this article, we will introduce in detail how to use PHP and GD library to generate verification code images. Step 1: Install and configure the GD library First, make sure your PHP environment has the GD library installed. If not installed

2023-07-13 comment 0  1124

Article Introduction：: Customizable PHP thumbnail generation program requires GD library support: The classic PHP thumbnail generation program, based on the GD library, can specify the generation path and the width and height details of the generation target. How to use: In a PHP environment that supports the GD library, Save the following code as resize.php to test the classic PHP thumbnail generation program. Based on the GD library, you can specify the generation path and the width and height details of the generation target: In a PHP environment that supports the GD library, save the following code as resize. The php test copy code is as follows: <? $FILENAME="image_name"

2016-07-29 comment 0  999

Article Introduction：There are several ways to generate graphic verification codes in PHP. To generate a graphical verification code, you need to use the php GD library. If you do not have an account with the GD library, we need to find extension=php_gd2.dll in the php.ini file and remove the previous ";" and then restart apache or

2016-07-20 comment 0  821

Article Introduction：Generate a simple verification code based on PHP, PHP generates a simple verification code. Generate a simple verification code based on PHP. PHP generates a simple verification code. Without further ado, I will post the code directly for you. The specific code is as follows: for($i=0;$i5;$i ){$rand .= dechex(rand(

2016-07-12 comment 0  993

Article Introduction：Best practices for using PHP and GD libraries to generate verification code images. In web development, in order to prevent malicious attacks and machine automation operations, many websites use verification codes to confirm the user's identity. A CAPTCHA is an image-based sequence of random characters that requires the user to enter correctly in order to continue accessing a website. This article will introduce the best practices for generating verification code images using PHP and the GD library, and provide code examples. The GD library is a commonly used graphics processing library. You can use the GD library to create, operate and output in PHP.

2023-07-13 comment 0  1205

Article Introduction：Best Practices for Generating Colorful Captcha Images Using PHP and GD Library When developing web applications, it is often necessary to use captchas to increase security and prevent malicious actions by robots. Using PHP and the GD library is a common way to generate captcha images. In this article, we will introduce how to use PHP and the GD library to generate colorful verification code images, and provide some best practice code examples. First, in order to use the GD library to generate color verification code images, we need to ensure that the GD library has been installed on the server. You can write it in PHP

2023-07-12 comment 0  767

Article Introduction：Summary of several methods for generating graphic verification codes in PHP. To generate a graphical verification code, you need to use the php GD library. If you do not have an account with the GD library, we need to find extension=php_gd2.dll in the php.ini file and remove the previous ";" and then restart apache or

2016-07-13 comment 0  780

Article Introduction：Common problems and solutions for PHP verification codes that cannot be generated. Verification codes written in PHP are widely used in website development and are an effective way to protect website security and prevent robot attacks. However, in the process of using PHP verification code, sometimes the verification code cannot be generated, which brings a lot of trouble to developers and users. This article will introduce common problems and solutions for PHP verification codes that cannot be generated, and hope to be helpful to PHP developers. 1. The PHP GD library is not enabled. The GD library is an extension library of PHP that provides some graphics operations.

2023-04-21 comment 0  1264

Article Introduction：GD is a very practical image processing library in PHP. Using the GD library, PHP developers can easily process, generate and output images, such as generating verification codes, thumbnails, watermarks, etc. This article will introduce the GD library to everyone and give some examples of using the GD library in PHP. The GD library is an open source library originally designed for C language and can be used to process various image formats such as JPEG, PNG, and GIF. After PHP5.0, the GD library can

2023-06-23 comment 0  1770

Article Introduction：PHP verification code generation program code. This article will introduce you to the program that uses session storage and gd library to generate verification codes. At the same time, some interference elements will be added, so that you can simply prevent machine registration. Let me give you

2016-07-13 comment 0  794