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。