php實現的驗證碼文件類實例，

php實現的驗證碼文件類實例，

本文實例講述了php實現的驗證碼文件類。分享給大家供大家參考。具體如下：

<?php
/**
* @file
* @version 1.0
* @author  網海浪子
* @brief   驗證碼文件類
*
*/
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();
?>

希望本文所述對大家的php程序設計有所幫助。