<?php

/**

* @file

* @version 1.0

* @author  网海浪子

* @brief   验证码文件类

*

*/

class CCheckCodeFile

{

//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  输出头

*

*/

private function OutFileHeader()

{

 header ("Content-type: image/png");

}

/**

*

* @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;

  $y = rand(0,$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()

{

 $this ->OutFileHeader();

 $this ->CreateCheckCode();

 $this ->CreateImage();

 $this ->SetDisturbColor();

 $this ->WriteCheckCodeToImage();

 imagepng($this->mCheckImage);

 imagedestroy($this->mCheckImage);

}

}

$c_check_code_image = new CCheckCodeFile();

//$c_check_code_image ->SetCheckImageWH(100,50);

//设置显示验证码图片的尺寸

$c_check_code_image ->OutCheckImage();

?>