Backend Development
PHP Tutorial
Detailed explanation of how to implement the verification code function on the web page in PHP
Detailed explanation of how to implement the verification code function on the web page in PHP
This article mainly introduces in detail the effect of php in making web page verification codes. It has certain reference value when applied to the practice of SMS verification codes and web page verification codes. Interested friends can refer to it
In actual development, we will use SMS verification codes and web page verification codes. Relatively speaking, the cost of web page verification codes is relatively low, and the security factor is also acceptable. Next, we will make a web page verification code, directly Above code:
First let’s talk about the file directory structure:
|----------phpyanzheng project folder
|----fonttype The folder contains font files. Font files generally end with .ttf and .otf
|----1.php Inside is placed the php language code
|----index.html Inside Put the web page layout
1.php
<?php
header('content-type:image/jpeg');//定义一下代码以jpeg文件来解析
$width = 120;//定义了图像的宽
$height = 40;//定义了图像的高
$element = array('q','w','e','r','t','y','u','i','o','p','l','k','j','h','g','f','d','s','a','z','x',
'c','v','b','n','m','1','2','3','4','5','6','7','8','9','0','Q','W','E','R','T','Y','U','I','O','P','A'
,'S','D','F','G','H','J','K','L','M','N','B','V','C','X','Z');//定义一个显示文本的数组
$string = '';
for($i=0;$i<4;$i++){
$string.=$element[rand(0,count($element)-1)];//随机产生四个文本目标
}
$img = imagecreatetruecolor($width, $height);//设置验证区宽高
$colorBg = imagecolorallocate($img,rand(185,255),rand(185,255),rand(185,255));//产生200-255的随机数
$colorBorder = imagecolorallocate($img,rand(50,100),rand(50,100),rand(50,100));//边框颜色
$colorDian = imagecolorallocate($img,rand(0,100),rand(0,100),rand(0,100));//背景小点的颜色
$colorLine = imagecolorallocate($img,rand(0,255),rand(0,255),rand(0,255));
$colorString = imagecolorallocate($img,rand(20,80),rand(20,80),rand(20,80));
imagefill($img, 0, 0, $colorBg);//设置位置和背景颜色
imagerectangle($img,0,0,$width-1,$height-1,$colorBorder);//画一个边框
for($i=0;$i<200;$i++){//循环出200个干扰点
imagesetpixel($img, rand(0, $width-1), rand(0, $height-1), $colorDian);
}
for($i=0;$i<round(5);$i++){//循环出5条干扰线
imageline($img,rand(0,$width/2),rand(0,$height/2),rand($width/2,$width),rand($height/2,$height),$colorLine);
}
//imagestring($img, 4, 0, 0,'a5dg', $colorString);
imagettftext($img,25,rand(5, 15),rand(0,40),39,$colorString,'fonttype/PrincetownStd.otf',$string);
// 图像名称 字体大小 倾斜角度 起始位置X轴 起始位置Y轴 颜色 字体位置 显示的内容
imagejpeg($img);//输出图像
?>index.html
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>孙三峰--验证码</title>
<script type="text/javascript" src="js/jquery-1.1.0.js" ></script>
</head>
<body>
<!--注意：原文中对应的ip地址是自己电脑端ip，如果不能正常运行，请修改ip-->
<p>
<label class="lbright">验证码：</label>
<span>
<input type="text" name="validcode" style="width:70px; vertical-align:middle;" id="validcode"/>
<img id="codePic" src="http://192.168.1.113:8601/PHP/phpyanzheng/1.php" width="120" height="40"/>
</span>
<span id="codePic" onclick="getPic();">看不清楚，换一张</span> <!---->
</p>
</body>
<script type="text/javascript">
function getPic(){
$("#codePic").attr("src","http://192.168.1.113:8601/PHP/phpyanzheng/1.php?flag="+Math.random()); <!--局部刷新-->
};
</script>
</html>The above is the entire content of this article, I hope it will be helpful to everyone's study.
Related recommendations:
How to implement the web page verification code function in Java
php jQuery ajaxWeb page verification code
How to use open source tools to make Web page verification code
The above is the detailed content of Detailed explanation of how to implement the verification code function on the web page in PHP. For more information, please follow other related articles on the PHP Chinese website!
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
Notepad++7.3.1
Easy-to-use and free code editor
SublimeText3 Chinese version
Chinese version, very easy to use
Zend Studio 13.0.1
Powerful PHP integrated development environment
Dreamweaver CS6
Visual web development tools
SublimeText3 Mac version
God-level code editing software (SublimeText3)
Hot Topics
1377
52
PHP 8.4 Installation and Upgrade guide for Ubuntu and Debian
Dec 24, 2024 pm 04:42 PM
PHP 8.4 brings several new features, security improvements, and performance improvements with healthy amounts of feature deprecations and removals. This guide explains how to install PHP 8.4 or upgrade to PHP 8.4 on Ubuntu, Debian, or their derivati
Discuss CakePHP
Sep 10, 2024 pm 05:28 PM
CakePHP is an open-source framework for PHP. It is intended to make developing, deploying and maintaining applications much easier. CakePHP is based on a MVC-like architecture that is both powerful and easy to grasp. Models, Views, and Controllers gu
How To Set Up Visual Studio Code (VS Code) for PHP Development
Dec 20, 2024 am 11:31 AM
Visual Studio Code, also known as VS Code, is a free source code editor — or integrated development environment (IDE) — available for all major operating systems. With a large collection of extensions for many programming languages, VS Code can be c
How do you parse and process HTML/XML in PHP?
Feb 07, 2025 am 11:57 AM
This tutorial demonstrates how to efficiently process XML documents using PHP. XML (eXtensible Markup Language) is a versatile text-based markup language designed for both human readability and machine parsing. It's commonly used for data storage an
CakePHP Quick Guide
Sep 10, 2024 pm 05:27 PM
CakePHP is an open source MVC framework. It makes developing, deploying and maintaining applications much easier. CakePHP has a number of libraries to reduce the overload of most common tasks.
PHP Program to Count Vowels in a String
Feb 07, 2025 pm 12:12 PM
A string is a sequence of characters, including letters, numbers, and symbols. This tutorial will learn how to calculate the number of vowels in a given string in PHP using different methods. The vowels in English are a, e, i, o, u, and they can be uppercase or lowercase. What is a vowel? Vowels are alphabetic characters that represent a specific pronunciation. There are five vowels in English, including uppercase and lowercase: a, e, i, o, u Example 1 Input: String = "Tutorialspoint" Output: 6 explain The vowels in the string "Tutorialspoint" are u, o, i, a, o, i. There are 6 yuan in total
Explain JSON Web Tokens (JWT) and their use case in PHP APIs.
Apr 05, 2025 am 12:04 AM
JWT is an open standard based on JSON, used to securely transmit information between parties, mainly for identity authentication and information exchange. 1. JWT consists of three parts: Header, Payload and Signature. 2. The working principle of JWT includes three steps: generating JWT, verifying JWT and parsing Payload. 3. When using JWT for authentication in PHP, JWT can be generated and verified, and user role and permission information can be included in advanced usage. 4. Common errors include signature verification failure, token expiration, and payload oversized. Debugging skills include using debugging tools and logging. 5. Performance optimization and best practices include using appropriate signature algorithms, setting validity periods reasonably,
7 PHP Functions I Regret I Didn't Know Before
Nov 13, 2024 am 09:42 AM
If you are an experienced PHP developer, you might have the feeling that you’ve been there and done that already.You have developed a significant number of applications, debugged millions of lines of code, and tweaked a bunch of scripts to achieve op
