Backend DevelopmentPHP TutorialHow to solve the problem that the verification code cannot be displayed on the PHP mall login interface
In PHP mall development, it is a common problem that the verification code cannot be displayed on the login interface. This situation is usually caused by some errors in the verification code generation and display code. To solve this problem, you need to check and debug the code that generates and displays the verification code. The following will introduce how to solve the problem that the verification code cannot be displayed on the PHP mall login interface, and provide specific code examples.
Step 1: Confirm whether the GD library is enabled
When using the verification code, you need to ensure that the GD library of PHP is enabled. The GD library is an extension library for processing images and contains many functions for processing images. We can use the phpinfo() function to check whether the GD library is enabled. The specific code is as follows:
<?php // 查看GD库是否启用 phpinfo(); ?>
Execute the above code to check whether the generated phpinfo page contains information related to the GD library. If not, you need to enable the GD library. You can search for extension=gd in php.ini, remove the preceding semicolon and save it before restarting the PHP service.
Step 2: Check the verification code generation code
The verification code generation code is usually processed in a separate PHP file. Make sure that the following code snippet is generated correctly. The verification code is generated and the value of the verification code is stored in SESSION:
<?php
session_start();
$chars = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789';
$code = '';
for ($i = 0; $i < 4; $i++) {
$code .= $chars[mt_rand(0, strlen($chars) - 1)];
}
$_SESSION['captcha'] = $code;
$width = 100;
$height = 30;
$image = imagecreatetruecolor($width, $height);
$bg_color = imagecolorallocate($image, 255, 255, 255);
$text_color = imagecolorallocate($image, 0, 0, 0);
imagefill($image, 0, 0, $bg_color);
imagestring($image, 5, 10, 5, $code, $text_color);
header('Content-type: image/png');
imagepng($image);
imagedestroy($image);
?>Ensure that the verification code generation part in the above code is correct, and the Content-type of the image is correctly set to image/png through the header function.
Step 3: Check the verification code display code
In the login interface where the verification code needs to be displayed, ensure that the following code can correctly display the generated verification code image:
<!DOCTYPE html>
<html>
<head>
<title>登录页面</title>
</head>
<body>
<form action="check_login.php" method="post">
<!-- 其他表单输入项 -->
<img src="/static/imghwm/default1.png" data-src="captcha.php" class="lazy" alt="验证码">
<input type="text" name="captcha_input" placeholder="请输入验证码">
<input type="submit" value="登录">
</form>
</body>
</html>In the above code, captcha.php is the PHP file that generates the verification code, ensuring that the verification code image can be displayed normally on the login interface.
Summary
Through the above steps, we can troubleshoot and solve the problem that the verification code cannot be displayed on the PHP mall login interface. First, you need to ensure that the GD library is enabled, and then check the code snippet for generating and displaying the verification code to ensure that the generated verification code image can be displayed correctly on the login interface. If you still have problems, you can debug the code step by step to ensure that each step is performed correctly. Hope the above content helps to solve this problem.
The above is the detailed content of How to solve the problem that the verification code cannot be displayed on the PHP mall login interface. For more information, please follow other related articles on the PHP Chinese website!
手机为什么收不到验证码Aug 17, 2023 pm 02:49 PM手机收不到验证码是网络问题、手机设置问题、手机运营商问题和个人设置问题导致的。详情介绍：1、网络问题，手机所处的网络环境不稳定或者信号弱，就有可能导致验证码无法及时送达；2、手机设置问题，不小心将手机的短信或语音功能关闭，或者将验证码的发送号码加入到黑名单中，从而导致验证码无法正常收到；3、手机运营商问题，手机运营商可能会出现故障或者维护，导致验证码无法及时送达等等。
PHP图片处理案例：如何实现图片的验证码功能Aug 17, 2023 pm 12:09 PMPHP图片处理案例：如何实现图片的验证码功能随着互联网的快速发展，验证码成为了保护网站安全的重要手段之一。验证码是一种通过图像识别技术来确定用户是否为真实用户的验证方式。本文将介绍如何使用PHP来实现图片的验证码功能，并附带代码示例。简介验证码是一张包含随机字符的图片，用户需要输入图片中的字符才能通过验证。实现验证码的主要过程包括生成随机字符、绘制字符到图片
验证码拦不住机器人了！谷歌AI已能精准识别模糊文字，GPT-4则装瞎求人帮忙Apr 12, 2023 am 09:46 AM“最烦登网站时各种奇奇怪怪（甚至变态）的验证码了。”现在，有一个好消息和一个坏消息。好消息就是：AI可以帮你代劳这件事了。不信你瞧，以下是三张识别难度依次递增的真实案例：而这些是一个名为“Pix2Struct”的模型给出的答案：全部准确无误、一字不差有没有？有网友感叹：确定，准确性比我强。所以可不可以做成浏览器插件？？不错，有人表示：别看这几个案例相比还算简单，但凡微调一下，我都不敢想象其效果有多厉害了。所以，坏消息就是——验证码马上就要拦不住机器人了！（危险危险危险……）如何做到？Pix2St
PHP开发指南：实现验证码登录Jul 01, 2023 am 09:27 AM随着互联网的发展和智能手机的普及，验证码登录功能被越来越多的网站和应用程序采用。验证码登录是一种通过输入正确的验证码来验证用户身份的登录方式，以提高安全性和防止恶意攻击。在PHP开发中，实现简单的验证码登录功能并不复杂，可以通过以下步骤来完成。创建数据库表首先，我们需要在数据库中创建一个用于存储验证码信息的表。表结构可以包含以下字段：id:自增主键phon
用OCR技术，自动识别各种验证码，工具已开源May 25, 2023 am 10:07 AM今天我在给大家分享一个OCR应用——ddddocr自动识别验证码。前面4个d是“带带弟弟”的首拼音。[/笑哭]。项目地址：https://github.com/sml2h3/ddddocr。使用的时候用pip命令直接安装即可pipinstallddddocr。OCR的核心技术包含两方面，一是目标检测模型检测图片中的文字，二是文字识别模型，将图片中的文字转成文本文字。第一类验证码最简单，它们没有复杂的背景图片，所以目标检测模型可以省略，直接将图片送入文字识别模型即可。识别代码如下：impor
如何使用PHP创建验证码图片？Sep 13, 2023 am 11:40 AM如何使用PHP创建验证码图片？验证码（CAPTCHA）是一种常用的验证用户是否为人而不是机器的方法。在网站上，我们经常会看到验证码图片，要求用户输入图片上显示的随机字符或数字，以完成登录、注册、评论等操作。本文将介绍如何使用PHP创建验证码图片，并提供具体的代码示例。一、PHPGD库要创建验证码图片，我们需要使用PHP的GD库。GD库是一个用于处理图像的扩
虚拟号码怎样接收验证码Oct 31, 2019 pm 04:52 PM虚拟号码接收验证码的方法：首先进入易码验证码接收平台；然后注册网站会员；接着打开短信验证码服务，并选择运营商；最后获取虚拟手机号，并到要发送验证码的平台，把手机号填上去，选择【发送验证码】即可。
react怎么实现手机验证码Jan 04, 2023 am 10:17 AMreact实现手机验证码的方法：1、下载antd button和input组件；2、通过“<Input className={`apiMobileInput`} disabled value={this.props.phoneNumber} />”获取客户的手机号；3、通过“await this.props.sendCode({...})”实现获取验证码即可。
Hot AI Tools
Undresser.AI Undress
AI-powered app for creating realistic nude photos
AI Clothes Remover
Online AI tool for removing clothes from photos.
Undress AI Tool
Undress images for free
Clothoff.io
AI clothes remover
AI Hentai Generator
Generate AI Hentai for free.
Hot Article
Hot Tools
MinGW - Minimalist GNU for Windows
This project is in the process of being migrated to osdn.net/projects/mingw, you can continue to follow us there. MinGW: A native Windows port of the GNU Compiler Collection (GCC), freely distributable import libraries and header files for building native Windows applications; includes extensions to the MSVC runtime to support C99 functionality. All MinGW software can run on 64-bit Windows platforms.
DVWA
Damn Vulnerable Web App (DVWA) is a PHP/MySQL web application that is very vulnerable. Its main goals are to be an aid for security professionals to test their skills and tools in a legal environment, to help web developers better understand the process of securing web applications, and to help teachers/students teach/learn in a classroom environment Web application security. The goal of DVWA is to practice some of the most common web vulnerabilities through a simple and straightforward interface, with varying degrees of difficulty. Please note that this software
SecLists
SecLists is the ultimate security tester's companion. It is a collection of various types of lists that are frequently used during security assessments, all in one place. SecLists helps make security testing more efficient and productive by conveniently providing all the lists a security tester might need. List types include usernames, passwords, URLs, fuzzing payloads, sensitive data patterns, web shells, and more. The tester can simply pull this repository onto a new test machine and he will have access to every type of list he needs.
WebStorm Mac version
Useful JavaScript development tools
SublimeText3 Linux new version
SublimeText3 Linux latest version
