PHP的中问验证码

            [U]复制代码[/U] 代码如下:
image = imagecreate($this->width,$this->hight);
  $this->color = imagecolorallocate($this->image,$this->red,$this->green,$this->blue);
  return imagefill($this->image,0,0,$this->color);
}
function createpix() //干扰因素
{
  for($this->i=1;$this->ipixnum;$this->i++)
  {
    $this->widthpx = rand(0,$this->width);
    $this->highty = rand(0,$this->hight);
   $this->pixcolor = imagecolorallocate($this->image,$this->pixred,$this->pixgreen,$this->pixblue);
     imagesetpixel($this->image,$this->widthpx,$this->highty,$this->pixcolor);
  }
}
  function gettxt() //创建验证码文字
{
  $this->txt = array("我","爱","你","叶","就","慧","明","发","真","的","很","想","不","知","到","为","什","么","就","是","忘","不","了","你","也","许","上","辈","欠","钱");
  for($this->i=0;$this->ii++)
  {
   $this->sub = $this->txt[rand(0,29)];
   $this->txtcode.= $this->sub;
  }
  $this->txtcode = iconv("GB2312","UTF-8",$this->txtcode);
  $_SESSION["code"] = $this->txtcode; //产生的验证ID
}
function createstring() //创建验证码图片
{
  imagettftext($this->image,20,5,0,40,$this->pixcolor,"C:\WINDOWS\Fonts\simsun.ttc ",$this->txtcode);
  header("content-type:image/png");
  return imagepng($this->image);
     imagedestroy($this->image);
}
function getcodeimage()//获得验证码图片
{
  $this->createimage();
  $this->gettxt();
  $this->createpix();   
  $this->createstring();
}
}
?>
createimage();
$text->gettxt();
$text->createpix();
$text->createstring();
?>