php实现的验证码文件类实例

本文实例讲述了php实现的验证码文件类。分享给大家供大家参考。具体如下：

    <?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();
    ?>

希望本文所述对大家的php程序设计有所帮助。