原文地址:http://www.windsfly.cn/blog/article.asp?id=1013
1、验证码类文件 CreateImg.class.php
<?php
/**
* @version 1.0
* @author Ben
* @date 2008-1-30
* @email jinmaodao116@163.com
* @验证码文件类
* int function imagecolorallocate(resource image, int red, int green, int blue) //为一幅图像分配颜色
* bool function imagefilledrectangle(resource image, int x1, int y1, int x2, int y2, int color) //画一矩形并填充
* bool function imagerectangle(resource image, int x1, int y1, int x2, int y2, int col) //画一个矩形
* bool function imagesetpixel(resource image, int x, int y, int color) //画一个单一像素
*/
class ValidationCode
{
private $width,$height,$codenum;
public $checkcode; //产生的验证码
private $checkimage; //验证码图片
private $disturbColor = ''; //干扰像素
/*
* 参数:(宽度,高度,字符个数)
*/
function __construct($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);
}
/*
* @brief 输出头
*/
private function outFileHeader()
{
header ("Content-type: image/png");
}
/**
* 产生验证码
*/
private function createCode()
{
$this->checkcode = strtoupper(substr(md5(rand()),0,$this->codenum));
}
/**
* 产生验证码图片
*/
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
}
/**
* 设置图片的干扰像素
*/
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);
}
}
/**
*
* 在验证码图片上逐个画上验证码
*
*/
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);
}
}
?>