php实现点击可刷新验证码，php实现刷新验证码
- WBOYOriginal
- 2016-06-13 08:51:311269browse
php实现点击可刷新验证码，php实现刷新验证码
验证码类文件 CreateImg.class.php
<?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
<?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
?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="max-width:90%" 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。
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
Previous article：有时候就是看不进论文-jQuery动画特效篇&MySQL，论文-jquery动画特效Next article：浅析PHP中call user func()函数及如何使用call user func调用自定义函数，callfunc