php实现的验证码文件类实例

<?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();
?>