标签：
标题文档
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<!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>无标题文档</title>
<script
language="javascript">
function refresh_code()
{
form1.imgcode.src="verifycode.php?a="+Math.random();
}
</script>
</head>
<body>
<form
id="form1" name="form1" method="post" action="checkcode.php">
<label
for="code">验证码：</label>
<input
type="text" name="code" id="textfield" />
<img
id="imgcode" src="VerifyCode.php" alt="验证码" />
<a
href="javascript:refresh_code()">看不清？换一个</a>
<input
type="submit" name="button" id="button" value="提交" />
</form>
</body>
</html>
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verifycode.php文件代码如下
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<?php
/*
图片验证码 Powered By KASON test <a href="
http://www.hzhuti.com/nokia/c6/">
http://www.hzhuti.com/nokia/c6/</a> */
session_start();
$num=4;//验证码个数
$width=80;//验证码宽度
$height=20;//验证码高度
$code=‘ ‘;
for($i=0;$i<$num;$i++)//生成验证码
{
switch(rand(0,2))
{
case
0:$code[$i]=chr(rand(48,57));break;//数字
case
1:$code[$i]=chr(rand(65,90));break;//大写字母
case
2:$code[$i]=chr(rand(97,122));break;//小写字母
}
}
$_SESSION["VerifyCode"]=$code;
$image=imagecreate($width,$height);
imagecolorallocate($image,255,255,255);
for($i=0;$i<80;$i++)//生成干扰像素
{
$dis_color=imagecolorallocate($image,rand(0,2555),rand(0,255),rand(0,255));
imagesetpixel($image,rand(1,$width),rand(1,$height),$dis_color);
}
for($i=0;$i<$num;$i++)//打印字符到图像
{
$char_color=imagecolorallocate($image,rand(0,2555),rand(0,255),rand(0,255));
imagechar($image,60,($width/$num)*$i,rand(0,5),$code[$i],$char_color);
}
header("Content-type:image/png");
imagepng($image);//输出图像到浏览器
imagedestroy($image);//释放资源
?>
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checkcode.php文件如下
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<meta http-equiv="Content-Type"
content="text/html; charset=utf-8"
/>
<?php
ini_set(‘display_errors‘,‘Off‘);
session_start();
if((strtoupper($_POST["code"])) ==strtoupper(($_SESSION["VerifyCode"]))){
print("验证码正确,");
}else{
print("验证码错误,");
}
echo
"提交的验证码:".strtoupper($_POST["code"]).",正确的验证码：".strtoupper($_SESSION["VerifyCode"]);
?>
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原文地址：http://my.oschina.net/stxcw/blog/487926
