This article mainly provides details for everyone This article introduces the generation code of PHP image verification code, which has certain reference value. Interested friends can refer to it
The specific content is as follows
1. Code
index..php
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>js+GD2函数制作无刷新验证码</title>
<link rel="stylesheet" type="text/css" href="css/style.css" rel="external nofollow" >
</head>
<body>
<p style="width: 750px; border: 1px solid #0D6C8C; text-align: left">
<p style="width:100%; height:25px; border:1px #FFFFFF solid; background:url(img/t-background.gif); color:#FFFFFF; padding-top:5px; padding-left:20px; text-align:left">填写用户注册信息</p>
<p style="width:400px; text-align:left; padding-left:50px; padding-top:15px; float:left">
<script language="javascript">
function chkinput(form)
{
if (form.username.value==''){
alert('请输入用户名！');
form.username.focus();
return false;
}
if (form.password.value==''){
alert('请输入注册密码！');
form.password.focus();
return false;
}
if (form.defPassword.value==''){
alert('请输入确认密码！');
form.defPassword.focus();
return false;
}
if (form.password.value.length<6){
alert('密码长度应大于6位！');
form.password.focus();
return false;
}
if (form.password.value!=form.defPassword.value){
alert('密码与确认密码不同！');
form.password.focus();
return false;
}
if (form . email . value == "") {
alert("请输入E-mail地址!");
form . email . select();
return (false);
}
var i= form . email . value . indexOf("@");
if (i < 0) {
alert("请输入正确的E-mail地址!");
form . email . select();
return (false);
}
if (form . tel . value == "") {
alert('请输入电话号码！');
form . tel . focus();
return (false);
}
var t=/^([0-9]|[\-])+$/g;
if (! t . test(form . tel . value) || form . tel . value . length > 18 || form . tel . value . length < 7) {
alert('电话格式输入有误！');
form . tel . focus();
return (false);
}
if (form.address.value==''){
alert('请输入联系地址！');
form.address.focus();
return false;
}
if (form.validatorCode.value==''){
alert('请输入验证码！');
form.validatorCode.focus();
return false;
}
if (form.validatorCode.value!=form.defValidatorCode.value) {
alert('验证码输入有误！');
form.validatorCode.focus();
return false;
}
return true;
}
</script>
<form name="form1" method="post" action="success.php" onSubmit="return chkinput(this)">
用户名： <input type="text" name="username" size="30" class="input" /><br><br>
密 码： <input type="password" name="password" size="30" class="input" /><br><br>
确认密码：<input type="password" name="defPassword" size="30" class="input"><br><br>
E-mail： <input type="text" name="email" size="30" class="input" /><br><br>
电话： <input type="text" name="tel" size="30" class="input" /><br><br>
联系地址：<input type="text" name="address" size="30" class="input" /><br><br>
验证码： <input type="text" name="validatorCode" size="10" class="input" />
<input type="hidden" name="defValidatorCode" value="" />
<script language="javascript">
var num1=Math.round(Math.random()*10000000);
var num=num1.toString().substr(0,4);
document.write("<img src="/static/imghwm/default1.png" data-src="TestCode.php?code=" class="lazy" name=codeimg src='TestCode.php?code="+num+"' alt="PHP image verification code generation code_php tips" >");
form1.defValidatorCode.value=num;
function reCode(){
var num1=Math.round(Math.random()*10000000);
var num=num1.toString().substr(0,4);
document.codeimg.+num;
form1.defValidatorCode.value=num;
}
</script>
<a href="javascript:reCode()" rel="external nofollow" class="a1">看不清</a>
<br><br>
<input type="submit" value="提交"> <input type="reset" value=" 重写">
</form>
</p>
<p style="width:300px; float:right; padding-top:20px">
<p style="width:285px; height:250px; border:1px dotted #999999; background:#E9F2F7; OVERFLOW-X: auto; OVERFLOW-Y:auto; text-align:left; line-height:20px">
用户在使用***网站网络服务过程中，必须遵循以下原则：<br />
1、遵守中国有关的法律和法规。不得利用本站危害国家安全、泄露国家秘密，不得侵犯国家社会集体的和公民的合法权益。不得利用***网站网络服务系统进行任何不利于***网站的行为。<br />
2、遵守所有与网络服务有关的网络协议、规定和程序。<br />
3、不干扰或混乱网络服务。<br />
4、不得为任何非法目的而使用本网络服务系统。<br />
5、不得传播任何虚假的、骚扰性的、中伤他人的、辱骂性的、恐吓性的、庸俗的或其他任何非法的信息资料。<br />
6、不得侵犯其他任何第三方的专利权、著作权、商标权、名誉权或其他任何合法权益。<br />
7、不得在论坛BBS或留言簿发表任何与政治相关的信息。 <br />
8、遵守所有使用网站服务的网络协议、规定、程序和惯例。<br />
9、如发现任何非法使用用户帐号，应立即通告***网站。<br />
10、如用户在使用网络服务时违反上述任何规定，***网站有权要求用户改正或直接取消该帐号并停止为该用户提供相关的网络服务。<br />
</p>
</p>
</p>
<?php
require_once 'footer.php';
?>
</body>
</html>
TestCode.php
<?php
class TestCode{//创建类名为TestCode
private $width;
private $height;
private $str;
private $im;
private $strColor;
function __construct($width,$height){
$this->width=$width;
$this->height=$height;
$this->str=$_GET['code'];
$this->createImage();
}
function createImage(){
$this->im=imagecreate($this->width,$this->height);//创建画布
imagecolorallocate($this->im,200,200,200);//为画布添加颜色
for($i=0;$i<4;$i++){//循环输出四个数字
$this->strColor=imagecolorallocate($this->im,rand(0,100),rand(0,100),rand(0,100));
imagestring($this->im,rand(3,5),$this->width/4*$i+rand(5,10),rand(2,5),$this->str[$i],$this->strColor);
}
for($i=0;$i<200;$i++){//循环输出200个像素点
$this->strColor=imagecolorallocate($this->im,rand(0,255),rand(0,255),rand(0,255));
imagesetpixel($this->im,rand(0,$this->width),rand(0,$this->height),$this->strColor);
}
}
function show(){//
header('content-type:image/png');//定义输出为图像类型
imagepng($this->im);//生成图像
imagedestroy($this->im);//销毁图像释放内存
}
}
$image=new TestCode(80,20);//将类实例化为对象
$image->show();//调用函数
?>
2. Running results
php Image verification codeGenerate sample code
phpImage verification codeGenerate
Share a piece of functional code for php to generate image verification code
The above is the detailed content of PHP image verification code generation code_php tips. For more information, please follow other related articles on the PHP Chinese website!
How does PHP identify a user's session?May 01, 2025 am 12:23 AMPHPidentifiesauser'ssessionusingsessioncookiesandsessionIDs.1)Whensession_start()iscalled,PHPgeneratesauniquesessionIDstoredinacookienamedPHPSESSIDontheuser'sbrowser.2)ThisIDallowsPHPtoretrievesessiondatafromtheserver.
What are some best practices for securing PHP sessions?May 01, 2025 am 12:22 AMThe security of PHP sessions can be achieved through the following measures: 1. Use session_regenerate_id() to regenerate the session ID when the user logs in or is an important operation. 2. Encrypt the transmission session ID through the HTTPS protocol. 3. Use session_save_path() to specify the secure directory to store session data and set permissions correctly.
Where are PHP session files stored by default?May 01, 2025 am 12:15 AMPHPsessionfilesarestoredinthedirectoryspecifiedbysession.save_path,typically/tmponUnix-likesystemsorC:\Windows\TemponWindows.Tocustomizethis:1)Usesession_save_path()tosetacustomdirectory,ensuringit'swritable;2)Verifythecustomdirectoryexistsandiswrita
How do you retrieve data from a PHP session?May 01, 2025 am 12:11 AMToretrievedatafromaPHPsession,startthesessionwithsession_start()andaccessvariablesinthe$_SESSIONarray.Forexample:1)Startthesession:session_start().2)Retrievedata:$username=$_SESSION['username'];echo"Welcome,".$username;.Sessionsareserver-si
How can you use sessions to implement a shopping cart?May 01, 2025 am 12:10 AMThe steps to build an efficient shopping cart system using sessions include: 1) Understand the definition and function of the session. The session is a server-side storage mechanism used to maintain user status across requests; 2) Implement basic session management, such as adding products to the shopping cart; 3) Expand to advanced usage, supporting product quantity management and deletion; 4) Optimize performance and security, by persisting session data and using secure session identifiers.
How do you create and use an interface in PHP?Apr 30, 2025 pm 03:40 PMThe article explains how to create, implement, and use interfaces in PHP, focusing on their benefits for code organization and maintainability.
What is the difference between crypt() and password_hash()?Apr 30, 2025 pm 03:39 PMThe article discusses the differences between crypt() and password_hash() in PHP for password hashing, focusing on their implementation, security, and suitability for modern web applications.
How can you prevent Cross-Site Scripting (XSS) in PHP?Apr 30, 2025 pm 03:38 PMArticle discusses preventing Cross-Site Scripting (XSS) in PHP through input validation, output encoding, and using tools like OWASP ESAPI and HTML Purifier.
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
Video Face Swap
Swap faces in any video effortlessly with our completely free AI face swap tool!
Hot Article
Hot Tools
VSCode Windows 64-bit Download
A free and powerful IDE editor launched by Microsoft
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
Atom editor mac version download
The most popular open source editor
Notepad++7.3.1
Easy-to-use and free code editor
SublimeText3 English version
Recommended: Win version, supports code prompts!
