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<?php defined('SYSPATH') or die('No direct scrīpt access.');
/**
*class name:indentifycode
*fonction:create an indentifycode
*version:1.0
*data:2008-4-15
*author:szlinz
*
*using:
* c_check_code_image = new indentifycode();
* $c_check_code_image ->SetCheckImageWH(100,50);//设置显示验证码图片的尺寸
* $c_check_code_image ->OutCheckImage("d:/www/images/abc.jpg");
*
*/
class Indentifycode
{
//验证码位数
private $mCheckCodeNum = 4;
//产生的验证码
private $mCheckCode = '';
//验证码的图片
private $mCheckImage = '';
//干扰像素
private $mDisturbColor = '';
//验证码的图片宽度
private $mCheckImageWidth = '80';
//验证码的图片宽度
private $mCheckImageHeight = '20';
/**
*
* @brief 产生验证码
*
*/
private function CreateCheckCode()
{
$this->mCheckCode = strtoupper(substr(md5(rand()),0,$this->mCheckCodeNum));
return $this->mCheckCode;
}
/**
*
* @brief 产生验证码图片
*
*/
private function CreateImage()
{
$this->mCheckImage = @imagecreate ($this->mCheckImageWidth,$this->mCheckImageHeight);
imagecolorallocate ($this->mCheckImage, 200, 200, 200);
return $this->mCheckImage;
}
/**
*
* @brief 设置图片的干扰像素
*
*/
private function SetDisturbColor()
{
for ($i=0;$i<=128;$i++)
{
$this->mDisturbColor = imagecolorallocate ($this->mCheckImage, rand(0,255), rand(0,255), rand(0,255));
imagesetpixel($this->mCheckImage,rand(2,128),rand(2,38),$this->mDisturbColor);
}
}
/**
*
* @brief 设置验证码图片的大小
*
* @param $width 宽
*
* @param $height 高
*
*/
public function SetCheckImageWH($width,$height)
{
if($width==''||$height=='')return false;
$this->mCheckImageWidth = $width;
$this->mCheckImageHeight = $height;
return true;
}
/**
*
* @brief 在验证码图片上逐个画上验证码
*
*/
private function WriteCheckCodeToImage()
{
for ($i=0;$i<$this->mCheckCodeNum;$i++)
{
$bg_color = imagecolorallocate ($this->mCheckImage, rand(0,255), rand(0,128), rand(0,255));
$x = floor($this->mCheckImageWidth/$this->mCheckCodeNum)*$i+15;
$y = rand(0,$this->mCheckImageHeight-15);
imagechar ($this->mCheckImage, 5, $x, $y, $this->mCheckCode[$i], $bg_color);
}
}
/**
*
* @brief 输出验证码图片
*
*/
public function OutCheckImage($filename)
{
$this ->CreateCheckCode();
$this ->CreateImage();
$this ->SetDisturbColor();
$this ->WriteCheckCodeToImage();
imagejpeg($this->mCheckImage,$filename);
}
}
?>
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