PHP中验证码类及使用方法(2)

              return $this->mCheckImage;

       }

       //设置图片的干扰像素

       function SetDisturbColor()

       {

              for ($i=0;$i<=128;$i++)

              {

                     $this->mDisturbColor = imagecolorallocate ($this->mCheckImage, rand(0,255), rand(0,255), rand(0,255));

                     imagesetpixel($this->mCheckImage,rand(1,100),rand(1,100),$this->mDisturbColor);

              }

       }

       //设置验证码图片的大小\宽\高

       function SetCheckImageWH($width,$height)

       {

              if($width==''||$height=='')return false;

              $this->mCheckImageWidth  = $width;

              $this->mCheckImageHeight = $height;

              return true;

       }

       //在验证码图片上逐个画上验证码

       function WriteCheckCodeToImage()

       {

              for ($i=0;$i<=$this->mCheckCodeNum;$i++)

              {

                     $bg_color = imagecolorallocate ($this->mCheckImage, rand(0,255), rand(0,255), 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);