php实现点击可刷新验证码

时间:2021-12-14 01:33:06

本文实例为大家分享了php点击可刷新验证码的具体代码,供大家参考,具体内容如下

验证码类文件 CreateImg.class.php

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<?php
 
class ValidationCode
{
private $width,$height,$codenum;
public $checkcode//产生的验证码
private $checkimage; //验证码图片
private $disturbColor = ''; //干扰像素
 
function __construct($width='80',$height='20',$codenum='4')
{
 $this->width=$width;
 $this->height=$height;
 $this->codenum=$codenum;
}
function outImg()
{
 //输出头
 $this->outFileHeader();
 //产生验证码
 $this->createCode();
 
 //产生图片
 $this->createImage();
 //设置干扰像素
 $this->setDisturbColor();
 //往图片上写验证码
 $this->writeCheckCodeToImage();
 imagepng($this->checkimage);
 imagedestroy($this->checkimage);
}
 
private function outFileHeader()
{
 header ("Content-type: image/png");
}
 
private function createCode()
{
 $this->checkcode = strtoupper(substr(md5(rand()),0,$this->codenum));
}
 
private function createImage()
{
 $this->checkimage = @imagecreate($this->width,$this->height);
 $back = imagecolorallocate($this->checkimage,255,255,255);
 $border = imagecolorallocate($this->checkimage,0,0,0);
 imagefilledrectangle($this->checkimage,0,0,$this->width - 1,$this->height - 1,$back); // 白色底
 imagerectangle($this->checkimage,0,0,$this->width - 1,$this->height - 1,$border); // 黑色边框
}
 
private function setDisturbColor()
{
 for ($i=0;$i<=200;$i++)
 {
 $this->disturbColor = imagecolorallocate($this->checkimage, rand(0,255), rand(0,255), rand(0,255));
 imagesetpixel($this->checkimage,rand(2,128),rand(2,38),$this->disturbColor);
 }
}
 
private function writeCheckCodeToImage()
{
 for ($i=0;$i<=$this->codenum;$i++)
 {
 $bg_color = imagecolorallocate ($this->checkimage, rand(0,255), rand(0,128), rand(0,255));
 $x = floor($this->width/$this->codenum)*$i;
 $y = rand(0,$this->height-15);
 imagechar ($this->checkimage, rand(5,8), $x, $y, $this->checkcode[$i], $bg_color);
 }
}
function __destruct()
{
 unset($this->width,$this->height,$this->codenum);
}
}
?>

包含文件imgcode.php

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<?php
session_start();
require_once('CreateImg.class.php');
$image = new ValidationCode('80','20','4'); //图片长度、宽度、字符个数
$image->outImg();
$_SESSION['validationcode'] = $image->checkcode; //存贮验证码到 $_SESSION 中
?>

前台文件 demo.php

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?php
session_start();
$test = $_POST['test'];
$test = strtoupper(trim($test));
$submit = $_POST['submit'];
if(isset($submit)){
if($test==$_SESSION['validationcode']){
 echo 'true';
} else {
 echo 'false';
}
}
?>
 
<html>
<head>
<title>Image</title>
<meta http-equiv="content-type" content="text/html;charset=utf-8">
<script language="javascript">
function newgdcode(obj,url) {
obj.src = url+ '?nowtime=' + new Date().getTime();
//后面传递一个随机参数,否则在IE7和火狐下,不刷新图片
}
</script>
<body>
<img src="imgcode.php" alt="看不清楚,换一张" align="absmiddle" style="cursor: pointer;" onclick="javascript:newgdcode(this,this.src);" />
<form method="POST" name="form1" action="image.php">
<input type="text" name="test">
<br />
<input type="submit" name="submit" value="提交">
</form>
</body>
</head>
</html>

以上就是为大家介绍的php点击验证码即可刷新的全部代码,希望对大家的学习有所帮助。