PHP驗證碼文件類

<?php
class CCheckCodeFile
{
//驗證碼位數
private $mCheckCodeNum  = 4;

//產生的驗證碼
private $mCheckCode   = '';
//驗證碼的圖片
private $mCheckImage  = '';
//干擾像素
private $mDisturbColor  = '';
//驗證碼的圖片寬度
private $mCheckImageWidth = '80';
//驗證碼的圖片寬度
private $mCheckImageHeight  = '20';
/*

@brief   輸出頭
/
private function OutFileHeader()
{
header ("Content-type: image/png");
}

/*

@brief   產生驗證碼
/
private function CreateCheckCode()
{
$this->mCheckCode = strtoupper(substr(md5(rand()),0,$this->mCheckCodeNum));
 return $this->mCheckCode;
}

/*

@brief   產生驗證碼圖片
/
private function CreateImage()
{
$this->mCheckImage = @imagecreate ($this->mCheckImageWidth,$this->mCheckImageHeight);
imagecolorallocate ($this->mCheckImage, 200, 200, 200);
 return $this->mCheckImage;
}

/*

@brief   設置圖片的干擾像素
/
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   設置驗證碼圖片的大小
*
@param   $width   寬
*
@param   $height 高
/
public function SetCheckImageWH($width,$height)
{
 if($width==''||$height=='')return false;
$this->mCheckImageWidth  = $width;
$this->mCheckImageHeight = $height;
 return true;
}

/*

@brief   在驗證碼圖片上逐個畫上驗證碼
/
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   輸出驗證碼圖片
/
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);//設置顯示驗證碼圖片的尺寸
$c_check_code_image ->OutCheckImage();
?></pre>