<?php
session_start();
echo @$_POST["code"]."<br>";
echo $_SESSION["code"]."<br>";
if (strtoupper($_POST["code"])==strtoupper($_SESSION["code"])){
echo "ok";
}else{
echo "error";
}
?>
<html>
<body>
<br>
<form action="imagecode.php" method="post">
<input type="text" name="code" onkeyup="if(this.value!=this.value.toUpperCase())this.value=this.value.toUpperCase()"><img alt="验证码" src="validationcode.php" onclick="this.src='validationcode.php?'+Math.random()"><br>
<input type="submit" value="sub">
</form>
</body>
</html>
<?php
session_start();
include 'validationcode.class.php';
$code = new ValidationCode();
$code->showImage();
$_SESSION["code"] = $code->getCheckCode();
?>
<?php
class ValidationCode{
private $width;
private $height;
private $codeNum;
private $image;
private $disturbColorNum;
private $checkCode;
function __construct($width=80,$height=20,$codeNum=4){
$this->width = $width;
$this->height = $height;
$this->codeNum = $codeNum;
$this->checkCode = $this->createCode();
//取整数
$this->disturbColorNum = floor($width*$height/15);
}
/**
* 向浏览器中输出验证码
*/
function showImage($fontface=""){
//第一步：创建图像背景
$this->getCreateImage();
//第二步：设置干扰元素
$this->setDisturColor();
//第三步：想图像中画出文本
$this->outPutText($fontface);
//第四部：输出图像
$this->outPutImage();
}
/**
* 获取验证码上的字符串
*/
function getCheckCode(){
return $this->checkCode;
}
/**
* 创建图像
*/
private function getCreateImage(){
//创建图像资源
$this->image = imagecreatetruecolor($this->width, $this->height);
//随即背景色
$backColor = imagecolorallocate($this->image, rand(180, 225), rand(180, 225), rand(180, 225));
//填充背景颜色
imagefill($this->image, 0, 0, $backColor);
//设置边框颜色
$border = imagecolorallocate($this->image, 0, 0, 0);
//画出边框
imagerectangle($this->image, 0, 0, $this->width-1, $this->height-1, $border);
}
/**
* 创建干扰元素
*/
private function setDisturColor(){
for ($i = 0; $i < $this->disturbColorNum; $i++) {
//设置颜色
$color = imagecolorallocate($this->image, rand(0, 255), rand(0, 255), rand(0, 255));
imagesetpixel($this->image, rand(1, $this->width-2), rand(1, $this->height-2), $color);
}
for ($i = 0; $i < 10; $i++) {
//设置颜色
$color = imagecolorallocate($this->image, rand(0, 255), rand(0, 255), rand(0, 255));
imagearc($this->image, rand(-10, $this->width), rand(-10, $this->height), rand(30, 300), rand(30, 200), 50, 40, $color);
}
}
/**
* 创建输出文本
*/
private function outPutText($fontface=""){
for ($i = 0; $i < $this->codeNum; $i++) {
$color = imagecolorallocate($this->image, rand(0, 150), rand(0, 150), rand(0, 150));
if ($fontface==""){
$font = rand(3, 5);
$x = floor($this->width/$this->codeNum)*$i+3;
$y = rand(0, $this->height-15);
imagechar($this->image, $font, $x, $y, $this->checkCode{$i}, $color);
}else{
$size = rand(12, 15);
$angle = rand(-30, 30);
$x = floor(($this->width-8)/$this->codeNum)*$i+8;
$y = rand($size, $this->height);
imagettftext($this->image, $size, $angle, $x, $y, $color, $fontface, $this->checkCode{$i});
}
}
}
private function createCode(){
$code = "23456789qwertyuipkjhgfdsazxcvbnmQWERTYUPLKJHGFDSAZXCVBNM";
$str = '';
for ($i = 0; $i < $this->codeNum; $i++) {
$char = $code{rand(0, strlen($code)-1)};
$str .= $char;
}
return $str;
}
/**
* 创建输出图像
*/
private function outPutImage(){
if (imagetypes() & IMG_GIF){
header("Content-Type:image/gif");
imagegif($this->image);
}else if (imagetypes() & IMG_JPG){
header("Content-Type:image/jpeg");
imagejpeg($this->image);
}else if (imagetypes() & IMG_PNG){
header("Content-Type:image/png");
imagepng($this->image);
}else{
die("php不支持图片创建");
}
}
/**
* 析构函数
*/
function __destruct(){
imagedestroy($this->$image);
}
}
?>
