1. php验证码类 点击可刷新
1、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);
}
}
?>
2、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
?>
3、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="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>
2. jQuery插件Real Person 点击可刷新
<!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>Untitled Document</title>
<script type="text/javascript" src="jquery.js"></script>
<script type="text/javascript" src="jquery.realperson.js"></script>
<link href="jquery.realperson.css" rel="stylesheet" type="text/css" />
<script type="text/javascript">
$(function(){
$('#Gideon').realperson({length: 5});
})
</script>
</head>
<body>
<input type="text" id="Gideon" name="defaultReal">
</body>
</html>
来源： http://keith-wood.name/realPerson.html
注：如果持续无法验证成功的话，请尝试下面的方法：
<?php
function rpHash($value) {
$hash = 5381;
$value = strtoupper($value);
for($i = 0; $i < strlen($value); $i++) {
$hash = (($hash << 5) + $hash) + ord(substr($value, $i));
}
return $hash;
}
?>
替换为：
<?
function rpHash($value)
{
$hash = 5381;
$value = strtoupper($value);
for($i = 0; $i < strlen($value); $i++) $hash = (leftShift32($hash, 5) + $hash) + ord(substr($value, $i));
return $hash;
}
function leftShift32($number, $steps)
{
$binary = decbin($number);
$binary = str_pad($binary, 32, "0", STR_PAD_LEFT);
$binary = $binary.str_repeat("0", $steps);
$binary = substr($binary, strlen($binary) - 32);
return ($binary{0} == "0" ? bindec($binary) : -(pow(2, 31) - bindec(substr($binary, 1))));
}
?>
3. php验证码 可计算（有限）
demo.php
<?php
session_start();
if(!empty($_POST['Login'])){
if(md5(strtoupper($_POST['Login'])) == $_SESSION['Login']){
echo 'Correct';
}else{
echo 'Error';
}
}
?>
<form method="post">
<input type="text" name="Login" value="" /><img src="img.php?Action=Login&imgW=80&imgH=30" align="absmiddle">
<input type="submit" value="Login" />
</form>
img.php
<?php
session_start();
/**
* 随机的数字,之和验证码
* 修改日期 2006-12-20
*/
function getCode ($length = 32, $mode = 0)
{
switch ($mode)
{
case '1':
$str = '123456789';
break;
case '2':
$str = 'abcdefghijklmnopqrstuvwxyz';
break;
case '3':
$str = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ';
break;
case '4':
$str = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz';
break;
case '5':
$str = 'ABCDEFGHIJKLMNPQRSTUVWXYZ123456789';
break;
case '6':
$str = 'abcdefghijklmnopqrstuvwxyz1234567890';
break;
default:
$str = 'ABCDEFGHIJKLMNPQRSTUVWXYZabcdefghijkmnpqrstuvwxyz23456789';
break;
}
$result = '';
$l = strlen($str)-1;
for($i = 0;$i < $length;$i ++)
{
$num = rand(0, $l);
$result .= $str[$num];
}
return $result;
}
//建立验证图片
function createAuthNumImg($randStr,$imgW=100,$imgH=40,$fontName)
{
header ("content-type: image/png");
$image = imagecreate($imgW , $imgH);
$color_white = imagecolorallocate($image , 255 , 255 , 255);
$color_gray = imagecolorallocate($image , 228 , 228 , 228);
$color_black = imagecolorallocate($image , 255 , 102 , 204);
for ($i = 0 ; $i < 1000 ; $i++)
{
imagesetpixel($image , mt_rand(0 , $imgW) , mt_rand(0 , $imgH) , $color_gray);
}
imagerectangle($image , 0 , 0 , $imgW - 1 , $imgH - 1 , $color_gray);
for ($i=10;$i<$imgH;$i+=10)
imageline($image, 0, $i, $imgW, $i, $color_gray);
imagettftext($image,16,5,3,25,$color_black,$fontName,$randStr);
for ($i=10;$i<$imgW;$i+=10)
imageline($image, $i, 0, $i, $imgH, $color_gray);
imagepng($image);
imagedestroy($image);
}
$a=GetCode(1,1);
$b=GetCode(1,1);
$c=GetCode(1,1);
$Passport=$a."+".$b."+".$c;
$Total=$a+$b+$c;
$Total;
$_SESSION[$_GET['Action']]=md5(strtoupper($Total));
createAuthNumImg($Passport,$_GET['imgW'],$_GET['imgH'],"verdana.ttf");
?>
3. Recaptcha（需要申请key,不过是免费的，类似Google key）
官网： http://recaptcha.net/resources.html
Examples
The following is a "Hello World" with reCAPTCHA:
<html>
<body>
<form action="" method="post">
<?php
require_once('recaptchalib.php');
// Get a key from http://recaptcha.net/api/getkey
$publickey = "6Lfc4wsAAAAAAM2-W6LHIYIA0NphCqZniVIXAKmp";
$privatekey = "6Lfc4wsAAAAAAEat7eqgrzOim3HG_lrzQ9_fvzwU";
# the response from reCAPTCHA
$resp = null;
# the error code from reCAPTCHA, if any
$error = null;
# was there a reCAPTCHA response?
if ($_POST["recaptcha_response_field"]) {
$resp = recaptcha_check_answer ($privatekey,
$_SERVER["REMOTE_ADDR"],
$_POST["recaptcha_challenge_field"],
$_POST["recaptcha_response_field"]);
if ($resp->is_valid) {
echo "You got it!";
} else {
# set the error code so that we can display it
$error = $resp->error;
}
}
echo recaptcha_get_html($publickey, $error);
?>
<br/>
<input type="submit" value="submit" />
</form>
</body>
</html>
The following example shows how to use Mailhide:
<html><body>
<?
require_once ("recaptchalib.php");
// get a key at http://mailhide.recaptcha.net/apikey
$mailhide_pubkey = '';
$mailhide_privkey = '';
?>
The Mailhide version of example@example.com is
<?
echo recaptcha_mailhide_html ($mailhide_pubkey,
$mailhide_privkey,
"example@example.com");
?>.
<br>
The url for the email is:
<?
echo recaptcha_mailhide_url ($mailhide_pubkey,
$mailhide_privkey,
"example@example.com");
?>
<br>
</body></html>
If you're looking for some more examples, take a look at the WordPress and MediaWiki plugins, which use this library.
4. 其他
带声音。
