search
Homephp教程PHP源码PHP实现验证码

<script>ec(2);</script>

数字验证码



  
   
/* 
    *   Filename: authpage.php 
    
*/ 
session_start();
     
//   srand((double)microtime()*1000000); 
        $authnum = $_SESSION[''authnum''];
        
//验证用户输入是否和验证码一致 
        if(isset($_POST[''authinput'']))  
        { 
                
if(strcmp($_POST[''authinput''],$_SESSION[''authnum''])==0
                        
echo "验证成功!"
                
else 
                        
echo "验证失败!"
        } 
    
        
//生成新的四位整数验证码 

    //    while(($authnum=rand()%10000)
    ?> 
        
form action=test4.php method=post> 
        
table> 
                请输入验证码:
input type=text name=authinput style="width: 80px">br> 
                
input type=submit name="验证" value="提交验证码"> 
                
input type=hidden name=authnum value= echo $authnum?>> 
                
img src=authimg.php?authnum= echo $authnum?>> 
        
table> 
        
form> 

 

 

 authimg.php



php 
//生成验证码图片 
Header("Content-type: image/PNG");  
srand((double)microtime()*1000000);//播下一个生成随机数字的种子,以方便下面随机数生成的使用

session_start();//将随机数存入session中
$_SESSION[''authnum'']="";
$im = imagecreate(62,20); //制定图片背景大小

$black = ImageColorAllocate($im, 0,0,0); //设定三种颜色
$white = ImageColorAllocate($im, 255,255,255); 
$gray = ImageColorAllocate($im, 200,200,200); 

imagefill(
$im,0,0,$gray); //采用区域填充法,设定(0,0)

while(($authnum=rand()%100000)10000);
//将四位整数验证码绘入图片 
$_SESSION[''authnum'']=$authnum;
imagestring(
$im, 5, 10, 3, $authnum, $black);
// 用 col 颜色将字符串 s 画到 image 所代表的图像的 x,y 座标处像的左上角为 0, 0)。
//如果 font 是 1,2,3,4 或 5,则使用内置字体


for($i=0;$i200;$i++)    //加入干扰象素 

     
$randcolor = ImageColorallocate($im,rand(0,255),rand(0,255),rand(0,255));
     imagesetpixel(
$im, rand()%70 , rand()%30 , $randcolor); 
}
ImagePNG(
$im); 
ImageDestroy(
$im); 
?>


Statement
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn

Hot AI Tools

Undresser.AI Undress

Undresser.AI Undress

AI-powered app for creating realistic nude photos

AI Clothes Remover

AI Clothes Remover

Online AI tool for removing clothes from photos.

Undress AI Tool

Undress AI Tool

Undress images for free

Clothoff.io

Clothoff.io

AI clothes remover

Video Face Swap

Video Face Swap

Swap faces in any video effortlessly with our completely free AI face swap tool!

Hot Tools

Atom editor mac version download

Atom editor mac version download

The most popular open source editor

Dreamweaver CS6

Dreamweaver CS6

Visual web development tools

mPDF

mPDF

mPDF is a PHP library that can generate PDF files from UTF-8 encoded HTML. The original author, Ian Back, wrote mPDF to output PDF files "on the fly" from his website and handle different languages. It is slower than original scripts like HTML2FPDF and produces larger files when using Unicode fonts, but supports CSS styles etc. and has a lot of enhancements. Supports almost all languages, including RTL (Arabic and Hebrew) and CJK (Chinese, Japanese and Korean). Supports nested block-level elements (such as P, DIV),

SublimeText3 Chinese version

SublimeText3 Chinese version

Chinese version, very easy to use

MantisBT

MantisBT

Mantis is an easy-to-deploy web-based defect tracking tool designed to aid in product defect tracking. It requires PHP, MySQL and a web server. Check out our demo and hosting services.