无标题文档
<!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>
verifycode.php文件代码如下
<?php /* 图片验证码 Powered By KASON test http://www.hzhuti.com/nokia/c6/ */ 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($image);//释放资源 ?>
checkcode.php文件如下
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<?php
ini_set('display_errors', 'Off');
session_start();
if((strtoupper($_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"]);
?>