Home

PHP Libraries

Other libraries

Graphical verification code library for PHP

Other libraries

Get it now

Graphical verification code library for PHP

<?php
require_once __DIR__.'/../vendor/autoload.php';
use Gregwar\Captcha\CaptchaBuilder;
$tests = 10000;
$passed = 0;
shell_exec('rm passed*.jpg');
for ($i=0; $i<$tests; $i++) {
    echo "Captcha $i/$tests... ";
    $captcha = new CaptchaBuilder;
    $captcha
        ->setDistortion(false)
        ->build()
    ;
    if ($captcha->isOCRReadable()) {
        $passed++;
        $captcha->save("passed$passed.jpg");
        echo "passed at ocr... ";
    } else {
        echo "failed... ";
    }
    echo "pass rate: ".round(100*$passed/($i+1),2)."%\n";
}
echo "\n";
echo "Over, $passed/$tests readed with OCR\n";

When logging in to the module with user permissions first, we will often use verification codes. Today I would like to recommend a verification code library for your future use.

The steps to generate a verification code are roughly:

1) Generate a random string;

2) Create an image (imagecreatetruecolor), and then output the string to In the image (imagestring or imagettftext);

3) Interfere with noise in the image, such as adding some lines or pixels (imageline and imagesetpixel).

4) Output image (imagepng)

5) Destroy image resources

Disclaimer

All resources on this site are contributed by netizens or reprinted by major download sites. Please check the integrity of the software yourself! All resources on this site are for learning reference only. Please do not use them for commercial purposes. Otherwise, you will be responsible for all consequences! If there is any infringement, please contact us to delete it. Contact information: admin@php.cn

Tips for generating simple graphical verification codes using PHP and GD library

13 Jul 2023

Tips for generating simple graphical verification codes using PHP and GD libraries. With the development of the Internet, preventing malicious attacks and abuse has become an indispensable part of website development. CAPTCHA is a technical means widely used to verify user identity and prevent malicious robots from registering and logging in. As a popular server-side programming language, PHP, combined with the GD library, can quickly generate simple graphical verification codes. 1. Introduction to GD library The GD library is an extension library of PHP. It provides a series of functions and methods for processing images. Through the GD library,

Tips for generating colorful verification code images using PHP and GD library

14 Jul 2023

Tips for generating colorful verification code images using PHP and GD libraries Introduction: Verification code is a common network security technology. By requiring users to enter a verification code when logging in, registering, or submitting a form, you can effectively prevent automated attacks from robots and malicious programs. This article will introduce the techniques of using PHP and GD libraries to generate colorful verification code images, helping developers to add a certain degree of recognizability and artistry when creating verification codes. 1. Environment preparation Before starting, make sure that PHP and GD libraries have been installed in your development environment. Can

Detailed steps for generating verification code images using PHP and GD library

13 Jul 2023

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

Generate image verification code using PHP and GD library

11 May 2023

With the development of the Internet, more and more websites need to use verification codes to prevent malicious registration, crawlers and other behaviors. Image verification code is a common form of verification code. It displays an image containing random characters or numbers, allowing users to enter the correct verification code before proceeding to the next step. This article will introduce how to use PHP and GD library to generate image verification codes. The GD library is an image processing library that can be used to generate, process and manipulate various image formats. PHP already has a built-in GD library and provides many functions for creating and manipulating graphs

Example of php verification code (GD library generates verification code)

25 Jul 2016

Example of php verification code (GD library generates verification code)

Detailed steps to generate irregular verification code images using PHP and GD library

12 Jul 2023

Detailed steps for generating irregular verification code images using PHP and GD libraries 1. Introduction Verification code (CAPTCHA) is a technology used to distinguish machines and humans. It is often used to prevent malicious programs from automating website attacks, spam, and malicious registrations. Generating irregular verification code images can increase the complexity of the verification code and improve security. This article will introduce the detailed steps on how to use PHP and GD library to generate irregular verification code images, and provide relevant code examples. 2. Preparation work: Make sure PHP is installed and the GD library is enabled.

See all articles